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Beyoncé's birthday was last week, falling on Labor Day weekend, and since most people were busy -- she seemed ready to party this weekend ... as was the rest of Hollywood.

The stars were out and on the prowl Saturday night ... hitting up a mansion in Bel Air, where Bey and Jay-Z were hosting to celebrate her the big 4-1. It would appear just about anyone who's anyone got an invite -- and they didn't hesitate to take Bey up on her offer to rage.

Huge celebs showed up dressed to the nines for this thing -- folks like Drake, Lizzo, Adele, Rich Paul, Jaden Smith, Bella Hadid, Kris Jenner, Kim K, Tristan Thompson, Khloe, MGK/Megan Fox, Lily-Rose Depp, Offset and even Vanessa Bryant.

Jigga himself also popped up on camera at one point ... but the birthday girl herself never surfaced for a pap photo. We're told people started arriving at 10:30, and stayed 'til about 3.

Take a look through the gallery, and you'll see ... it's a conveyer belt of stardom. If anyone can get famous people together all in one place, it's still Beyoncé. Impressive, no doubt.

Tommy Lee is going where many others have gone before him to show a little skin -- namely, OnlyFans ... where TL suggests he'll post penis pics and then some.

The Mötley Crüe drummer was performing in Vegas Friday night -- the final stop on the band's tour -- and at one point, he made a little speech to the crowd ... saying he was kinda bummed his explicit photo was taken down by Instagram, so he found a solution.

The answer, it seems, is to head to OF -- where Tommy says you can post what you want without any fear. He then showed off the goods ... not his front side, but the back.

Indeed ... the words "Only" and "Fans" were plastered across his ass for the whole world to see.

Tommy took to IG soon afterward to confirm he had in fact started an account, posting a similar shot of his butt and adding this caption as well ... "You heard it here tonight www.onlyfans.com/TommyLee 😜 cum join me over there for fun that Instagram won’t let us have here!" He also added some pics of his wife, Brittany Furlan --  maybe as a tease?

Many will recall ... Tommy threw up a nude about a month ago out of nowhere, which took the internet by storm. He later said he did it in drunkenness -- but now, it sounds like he wants to throw up more. He'd be far from the first celeb to jump over to the sultry site.

Swedish House Mafia had their fans dancing in the pouring rain, despite their team begging them to cut things short in order to save millions of dollars worth of equipment.

The DJ trio sold out Banc of California Stadium Friday in LA while the rain poured down for almost the entire show. Sources close to the group tell us their team begged the guys to end things early on several occasions in order to preserve equipment, but they insisted to keep playing for their fans.

We’re told as a result, millions worth of audio and stage design equipment will need to be repaired or entirely replaced.

SHM has been rocking shows across the US over the last few weeks, and LA was the biggest outdoor show they’ve done on tour … they even added more effects for the venue.

Of course, the group headlined closing night of Coachella earlier this year, after dropping their album “Paradise Again.”

Some of Britain's biggest rock stars tipped their hats to the late Queen Elizabeth -- including a few fellas who've had her sword tapped on their shoulders.

First off, Harry Styles took a moment to acknowledge QE2's passing Thursday night during his concert at Madison Square Garden -- asking the crowd to give her a round of applause for 70 years of service.

The MSG crowd gave it up big time for the Queen ... and Harry then promised a mood shift to nothing but fun for the rest of the evening.

He wasn't the only Brit who shouted out Her Majesty Thursday during a live performance -- Sir Elton John also paid his respects during his gig in Toronto ... speaking a bit more at length and from the heart.

EJ said he knew the Queen personally and had spent some time with her -- including during his knighting in 1998 -- and noted she'd led the country through some turbulent times in the 20th century, always with aplomb. Elton sent his thoughts and prayers to her whole family.

He also said he was happy she was finally at rest. Elton also released a statement with even more condolences.

More tributes poured in from other music greats, who'd also been knighted ... including Sirs Mick Jagger and Paul McCartney.

MJ wrote, "For my whole life Her Majesty, Queen Elizabeth II has always been there. In my childhood I can recall watching her wedding highlights on TV. I remember her as a beautiful young lady, to the much beloved grandmother of the nation. My deepest sympathies are with the Royal family."

For his part, Paul took to Twitter to say succinctly... "God bless Queen Elizabeth II. May she rest in peace. Long live The King." Both he and Mick attached photos of QE2 in her youth.

Harry Styles is leaning into the whole "I hawked a loogie on Chris Pine" story by leaning in on it ... which is exactly what he did Wednesday night in concert.

Harry performed to a sold-out crowd at Madison Square Garden, where he told his fans he had just popped over to Venice to spit on his fellow costar of "Don't Worry Darling." No doubt he was trying to telegraph the story was BS, and the fans ate it up.

As you know, a video's been circulating that shows Harry taking his seat next to Chris Pine at the Venice Film Festival and as he sits it looks like he spits on Chris's lap, and Chris reacts in a way that aligns with what lots of folks think.

Chris's rep called the story ridiculous, saying it never happened. However, a source very close to Chris tells TMZ the actor had said privately that it did indeed happen.

Paul Anka just got a huge tribute over in France ... where President Emmanuel Macron presented him with one of the nation's highest honors.

The "Put Your Head On My Shoulder Singer" tells TMZ ... he's humbled and proud to become an officer in the French order of merit, with Macron bestowing the honor this week in Paris.

As you see, Paul and Macron shared a toast and sipped Champagne during the celebration ... and Anka's got a pretty spiffy badge -- a blue sash with the star of a Grand Cross, signifying the award.

France's "Ordre national du Mérite" was first bestowed way back in 1963 under then-president Charles de Gaulle ... and while it's generally reserved for French citizens, Paul joins a select list of foreign recipients and he's easily the biggest name.

Paul tells us it was a "very special moment for him" ... and you can tell from the pics ... he's wearing a huge grin.

Remember ... Paul is still playing sold-out venues across the world at age 81, including packed houses in France on his recent European tour.

The Weeknd abruptly canceled his Los Angeles show last week after losing his voice -- but his road to recovery is going great -- so says the singer's medical team.

Abel made the happy announcement Tuesday, just days after Saturday night's show at SoFi Stadium, writing, "doctor says my voice is safe and with rest i'll be solid and able to bring the show my TORONTO fans are waiting for. LA date is being worked out soon. thank you SO much for all the love and understanding that's come my way. i love you all so much ... XO"

September 22 will mark the singer's return to the stage for a previously postponed show in Toronto, The Weeknd's hometown. As we previously reported, that show was pushed after a cellular outage caused security and tech issues that prevented the concert from happening.

It was only 15 mins into Saturday's show in L.A. when Abel disappeared from the stage during "I Can't Feel My Face" ... only to come out a couple minutes later to let the crowd know he had lost his voice during a previous song.

The Weeknd was visibly devastated, getting choked up as he announced the show needed to end way early.

Justin Bieber is pulling the plug on his world tour ... saying he has to make his health a priority.

Bieber's tour -- Justice World Tour -- has been rolling along since March, but there are still 70 shows left that will run until March 2023, and those are the shows that have now been suspended.

Bieber seems to be saying part of the reason for suspending is physical, and part is mental.

He said, after recently performing in Brazil, "After getting off the stage, the exhaustion overtook me and I realize that I need to make my health the priority right now."

He went on ... "So I'm going to take a break from touring for the time being. I'm going to be ok, but I need time to rest and get better."

A source with direct knowledge tells TMZ, a significant reason for the suspension is mental health ... Justin's been struggling in the last few years and it has taken its toll. Another reason is his recent health scare which partially paralyzed his face.

Debbie Rowe, Michael Jackson's ex-wife and mother of 2 of his children, worked for a Beverly Hills dermatologist for decades, and for the first time, she reveals a shocking story of how Dr. Arnie Klein traded drugs for entry into the celebrity lifestyle.

Rowe has never done an interview before ... she will not talk about Michael Jackson. Rowe appears in the TMZ special, "Who Really Killed Michael Jackson" on Fox Network Tuesday night at 8 PM.

As you'll see in the documentary, Dr. Klein plied Michael with massive doses of Demerol on an almost daily basis in the months leading up to his death.

Rowe says powerful people would call Klein, invite him to a party and ask for drugs as party favors. Rowe says on party night there'd be 90 Percocet pills or other drugs in a candy dish. She says he regularly traded drugs for access.

Sanjaya Malakar says he wants to be involved in the LGBTQ community in a big way after coming out as bisexual ... years after he was advised to hide his sexuality to not lose fans.

The former "American Idol" contestant -- who was a polarizing figure on season six -- tells TMZ ... he wants to help LGBTQ youth who are experiencing the same struggles he faced as a teen, with his main message being, "no one can navigate your sexuality but you."

Sanjaya, now 32, stepped out of the limelight years ago and now works as a pastry chef in Montana. He's ready to come back to Hollywood but is treading lightly, as he's not looking to become a punchline and only wants to focus on positive messages benefitting kids and teens.

He tells us some of the ways he envisions himself helping LGBTQ youth is by working with kids one-on-one, singing at fundraisers dedicated to helping the LGBTQ community and making TV show appearances where he can elaborate on how he navigated his sexuality during "American Idol."

Sanjaya says some of the most rewarding work he's done has been working with kids ... following 'AI', he volunteered at an after-school program helping kids with stage fright.

If you missed it, Sanjaya recently appeared on "The Adam Sank Show," where he explained during his time on 'AI' his publicists encouraged him to keep his sexuality secret, after fans speculated he was gay. Sanjaya says the experience was traumatizing ... but feels compelled to take control of his narrative now that he's comfortable with his sexuality.

Kelly Clarkson is fully back in the saddle of the show that made her famous ... after a long period where she wanted no association with the show.

Kelly posted an homage to "American Idol" Sunday ... marking a big anniversary ... "20 years ago today I won American Idol and it forever changed the course of my life. That moment was the door that opened up so much access and opportunity, and creative partnerships that I will be grateful for all of my days."

As you know Kelly won the competition in Season 1, helping launch the show into orbit and cementing her status as a star.

She went on ... "The family and friendships I have created over these 20 years in music and TV are priceless to me. We only get so many trips around the sun and while I am proud and feel abundantly blessed of the successes and failures that I have learned from, I am most proud and grateful for those friends that have become my family, and for their arms that have held me when I needed it and their hearts that listened to me when I felt lost. Without them I would not be where I am. I would probably not be here at all."

Adele and Eminem are on the cusp of becoming EGOT winners, because they just snagged a crucial letter in the acronym ... a couple of Emmys, respectively.

The artists won awards Saturday during the 2-day Creative Arts Emmys ceremony in Los Angeles. Adele's 'One Night Only' show -- where she was singing at the Griffith Observatory last year -- took home five Emmys, in fact ... including for Outstanding Variety Special.

As for Em ... he too won for Outstanding Variety Special, although his was for the live version (Adele's was pre-recorded). As we reported ... him, Dre and the rest of the SB gang are all Emmy winners now for their Halftime Show performance earlier this year.

With Shady, that means he's just a T away from EGOT. His longtime manager, Paul Rosenberg, noted that on Twitter.

Just for a refresher -- Eminem has won an Oscar for Best Original Song in "Lose Yourself" ('8 Mile), tons of Grammys, and now ... an Emmy for his Super Bowl gig. Adele has also won an Oscar for Best Original Song in "Skyfall," Grammys galore, and now this as well.

The Tony is by far the hardest award to win for entertainers who don't normally do theater work (like these two) ... but there's ways to earn one without having to necessarily perform.

They could each write songs for Broadway shows and win that way, or contribute to the musical arrangement of an original song -- which is well within their wheelhouse. Both could easily do something like that and potentially win a Tony, assuming they're interested.

If they each won EGOTs, they'd join a relatively small and prestigious list of past winners -- including Whoopi Goldberg, John Legend, Rita Moreno, Mel Brooks and a handful of others.

For now, though, they're on the list of 4-award winners, sharing company with Liza Minnelli, Barbra Streisand, James Earl Jones, Quincy Jones and Harry Belafonte.

Not a bad crowd!

The Weeknd barely got started performing the second of his 2 sold-out shows in L.A. Saturday night when he lost his voice ... and he was almost in tears.

SoFi Stadium was packed with 70,000 fans when 15 minutes in the band started playing "Can't Feel My Face." Thing is ... the Weeknd was nowhere to be seen.

Turns out he was backstage as the song played, trying to figure out what to do because had had no voice. Something happened during the previous song -- he yelled and apparently it blew out his vocal cords.

The audience didn't know what was up ... the song played and there was no Weeknd in sight. When the song ended, he came onstage and told the crowd, "It's killing me," but the show had to abruptly end because he had no voice.

He said, fighting back tears, "I can't give you the concert I want to give you," promising everyone would get their money back and he would reschedule soon.

The Weeknd was profusely apologetic and clearly emotional. This was a big part of his After Hours Til Dawn Tour, and he knew how much the show meant to his fans.

You hear pretty much the entire crowd was on Weeknd's side, applauding him for being transparent.

After he left the venue, The Weeknd posted, "My voice went out during the first song and I’m devastated. Felt it go and my heart dropped. I promise I'll make it up to you with a new date."

This isn't the first speed bump for the tour ... it was postponed twice before because of the pandemic.

Dave Grohl had some musical and emotional backup at the tribute concert for the Foo Fighters' late drummer, Taylor Hawkins ... his son got behind the drum set to honor his dad.

The London concert was packed with stars who participated, including Paul McCartney, Queen’s Brian May and Roger Taylor, Travis Barker, Dave Chappelle and Chris Rock.

Dave got super emotional as he performed "Times Like These."

There were incredibly touching moments ... Tyler's 16-year-old son, Oliver Shane, played drums on "My Hero."

Travis got behind the drum set for a spectacular version of "The Pretender," and "Monkey Wrench."

There were other musicians who joined in ... The Darkness’ Rufus Tiger Taylor and Justin Hawkins, Wolfgang Van Halen, AC/DC's Brian Johnson, Metallica's Lars Ulrich, Rush's Geddy Lee, Led Zeppelin's John Paul Jones, and Oasis' Liam Gallagher.

As we reported, Taylor was found dead in a hotel room, aged 50, just hours before he was due on stage with his bandmates in Bogota, Colombia, in March. The cause of death was cardiovascular collapse. Taylor was only 50.

There will be a second tribute concert at the Kia Forum in Inglewood Sept. 27th.

Dave Grohl did Taylor Hawkins proud during the latter's tribute show in the UK -- with the Foo Fighters frontman taking on the station that his late bandmate once helmed.

The show is currently underway in London, where Dave and a slew of other artists are doing a huge concert at Wembley Stadium in honor of Hawkins -- who died earlier this year. The lineup is stacked ... with members of several iconic bands scheduled to hit the stage.

Some of those acts include ... Nirvana, Metallica, Queen, Led Zeppelin, RUSH, AC/DC and The Police. Liam Gallagher of Oasis also performed, with Dave backing him on percussion.

There were a number of emotional moments throughout the concert, which is now winding down. At one point ... Dave's voice started to crack a bit when he was talking about Taylor, but he pulled it together and carried on. Safe to say, the vibe was very bittersweet.

As you can imagine, the place was absolutely packed ... which makes total sense. The sheer number of artists on the bill for this is staggering -- which just speaks to how much TH meant to the music community. But yeah, this is a show folks definitely didn't want to miss.

It's actually the first of two tribute concerts that are going to be done on behalf of Taylor -- there's another that's scheduled in Los Angeles later this month ... and that one, too, is likely to be star-studded. Anyone who isn't there now will probably show up in L.A.

As we reported ... Taylor was found dead at his hotel in Colombia, where he was touring with his band. An official cause of death has yet to be released, but an overdose of some sort seems to be what might've killed him -- upwards of 10 different substances were found to be in his system when an autopsy was done.

Kevin Federline says his sons haven't seen their mom, Britney Spears, in nearly 6 months, and we've learned the relationship continues to sour -- especially since Britney went after her boys online.

Sources with direct knowledge tell TMZ ... Britney's two boys, 16-year-old Sean Preston and 15-year-old Jayden James, aren't ready to go see their mom after she blasted their conduct as "hateful" in an Instagram post last month.

We're told Britney's post made an already frayed relationship even more strained, and there's a lot of anger built up against her.

Kevin's attorney, Mark Vincent Kaplan tells TMZ ... "While I will not comment on whether there were or were not regular custodial exchanges, one must consider that the comments about the boys such as those that were recently published hardly create a pro custodial environment. This is something that the parties involved will have to work out over time."

As we reported, Thursday Britney turned to Instagram to once again post about her boys after 15-year-old Jayden did an interview claiming he felt Britney gave him more attention than Preston. Britney wrote, ""Finally at 40 without the restraints of what my family did to me ... I say to my son Jayden that I send all the love in the world to you every day for the rest of my life!!! My love for my children has no boundaries."

As we told you last month, Kaplan claims the boys feel uncomfortable around their mom, and Kevin posted a series of videos the boys recorded under Britney's care where she disciplined them.

Remember, Britney's been beefing with Kevin recently over his tell-all interview that he shot a few months ago with a UK tabloid about their private lives, and the kids are caught up in the drama.

New clips from that interview are set to air Sunday on "60 Minutes: Australia."