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Ja Rule has made his services widely available to the general public -- the dude's offering up private party bookings now ... something his old foe, 50 Cent, finds awfully hilarious.

The rapper made an appearance this weekend at a private house party in New Jersey, where it looks like he was hired by a bunch of hotties to perform a few hit songs and hang out for a bit. One classic jam of his that he got around to playing ... "I'm Real," featuring J Lo.

Everyone was having a good ol' time, and Ja certainly had no shame in announcing that, yes, people CAN book him for gigs like this now. He's partnered up with ICONN, and there's an official way you can go about getting Ja to come to your shindig ... for a pretty penny.

Sounds neat, but of course ... there's always haters lurking in the back ready to pounce. In this case, Ja's nemesis, Fitty, came with a bag of jokes ready to fly at JR's expense.

He took to IG and wrote, "if you don’t want to end up doing private birthday parties for 15 people. 🤷🏽‍♂️stay out of my way, OK." Some folks credit 50 with stunting Ja's career -- at least that's how 50 sees it -- and he rides that narrative to no end ... constantly clowning the guy.

Donald Trump's being accused of being petty again ... and this time it's got Petty written all over it.

Tom Petty's family is outraged the Trump campaign dared to use the song, "I Won't Back Down," Saturday night at his Tulsa rally.

Tom's widow, Dana, and other family members said the song is about all of us and it should not be played "to further a campaign that leaves too many Americans and common sense left behind”

The family said ...“Tom wrote this song for the underdog, for the common man and for everyone ... We want to make it clear that we believe everyone is free to vote as they like, think as they like, but the Petty family doesn’t stand for this. We believe in America and we believe in democracy. But Donald Trump is not representing the noble ideals of either.

And, the family added this ... "We would hate for fans that are marginalized by this administration to think we were complicit in this usage. Concurrently, we have issued a cease and desist notice to the Trump campaign.”

So, the family has fired off a cease and desist letter to the campaign.

The Petty family is not alone. Among the singers who have railed against Trump for using their music ... Elton John, Prince, Aerosmith, REM, Adele, the Rolling Stones, Guns N Roses, Rihanna, Neil Young, Pharrell, Queen and Earth Wind and Fire have also denounced the president’s use of their music.

Jay-Z, Beyonce and the kids hopped aboard a private jet Friday for the Hamptons, but not before Bey released a new song -- "Black Parade" -- on Juneteenth.

Bey and Jay were decked out in face masks and super comfy sweatsuits. She's carrying Rumi Carter, and Jay's with Sir Carter. Blue Ivy was also front and center.

Beyonce's new song is an anthem to support black-owned businesses, and proceeds will benefit these small shops and companies. It was inspired by the brutal murder of George Floyd and is all about resilience and empowerment.

Bey said, "Happy Juneteenth Weekend! I hope we continue to share joy and celebrate each other, even in the midst of struggle. Please continue to remember our beauty, strentgh and power," adding, "BLACK PARADE celebrates you, your voice and your joy and will benefit Black-owned small businesses."

Post Malone is adding digital bartender and sommelier to his ever-growing resume ... because his new line of French wine is already a huge hit!!!

The "Better Now" rapper officially released his own French rosé, Maison No. 9, and it's already in high demand ... we're told Posty sold 50,000 bottles in 2 days during its pre-sale, wiping out the first round of inventory in a flash.

Post's fans sure are thirsty ... we're told Vivino, the sales platform hawking the booze, crashed on the first morning of the pre-sale because it couldn't handle the flood of orders.

The rosé is flying off the shelves at $21.99 a bottle ... it's named after Post's favorite tarot card (yes, he has one), the Nine of Swords. This is no cheapo novelty wine, either ... the drunk good folks at Wine.com rated it a 90 overall.

If you missed the pre-sale rush, chill. Post's rosé will be available online Monday in almost all states.

As if Post needs another reason to pop bottles. Cheers!!!

Danielle Bregoli -- AKA Bhad Bhabie -- is returning to her regularly scheduled program in the music biz, 'cause she's out of rehab and ready to get back to work.

Sources close to Bhad Bhabie tell TMZ ... the 17-year-old rapper was released Wednesday after completing a 30-day rehab program. We're told she feels great and is happy to be back out and about. We're told her main focus now is her music.

Danielle took to Instagram Thursday and posted a mirror shot, and she looks great ... like rehab really did her well. She also went live to say a little about her time in treatment -- saying she had a lot going on in her personal life and needed to separate herself from some people.

Odell Beckham, Kyle Kuzma and a TON of other people put social distancing to the wayside Wednesday night to party with Teyana Taylor ... and only about half the people were wearing masks!

Taylor had a huge listening party for her new album, "The Album," at a mansion in Beverly Hills ... which was supposed to include a heavy dose of social distancing and PPE.

In fact, the invite even spelled out guests would get hazmat suits and masks on the way in.

But, check out some shots from inside ... at one point, a BUNCH of people gathered to listen to music in a small room -- several of them NOT wearing masks!

One of whom is model Winnie Harlow, who's dating the Los Angeles Lakers star, Kyle Kuzma ... who's getting ready to head to Florida to continue the NBA season in a bubble environment!

Cardi B was also at the party with Offset and Kulture -- and you can see Cardi was partying mask-off too.

Outside in the yard, guests were invited to make their own graffiti art -- which is cool -- but we're hoping they washed their hands if sharing the same spray cans!

Look, we're all HOPING nobody has the virus and everyone is safe ... but fact is, Coronavirus cases in California are spiking, particularly in Los Angeles.

There were 2,000 new reported cases across the state on Wednesday.

And, in L.A. County alone, the numbers of COVID-related deaths are about to cross 3,000 ... with more than 73,000 confirmed cases.

H.E.R. wants to send a powerful message with her new song honoring George Floyd -- one that captures the feelings and concerns millions of Americans have since he was killed.

The Grammy winner tells us why she had to write, "I Can't Breathe," after conversations with fellow artists, and herself, about Floyd's death and the country's emotional reaction to it.

H.E.R. says the track tackles one important question that's been ringing in the heads of so many people lately: Why is there so much hate???

The singer/songwriter believes all artists should use their platform to talk about the George Floyd tragedy, because music can be a powerful vehicle for change. Specifically, the change she wants to see is healing -- and she's confident her new track can do that.

We had a great convo with H.E.R. about why it's important for artists to speak from the heart now, and music bridging the racial divide in America. You can see all of that on Thursday's TMZ Live.

One of Jay-Z and Beyonce's songs, "Black Effect," leans heavily on a Jamaican artist, who claims she was never given proper credit or compensation ... despite being the leading voice on the track.

Dr. L'Antoinette Stines says she's renowned in Jamaica for "her artistry and wisdom" -- and to that point, she says the Carters sought her ought in March 2018 to provide dancers for a video promoting their upcoming tour.

According to a lawsuit, filed Tuesday in federal court, Dr. Stines claims she hooked 'em up with dancers, and then Jay and Bey wanted to record her views on love. She claims she was told the interview would be used in the video ... "for promotional purposes" only.

In the docs, obtained by TMZ, she says she was shocked when she heard "Black Effect" -- from The Carters' "Everything Is Love" album -- because the whole first minute of the track is just her voice.

Hearing herself on the song -- uncredited, mind you -- left Dr. Stines feeling "artistically raped" ... according to her lawsuit.

The doc claims a contract for her services was only thrust in front of her on the day of the shoot, and she alleges the Carters' reps told her not to worry ... after all, her interview would only be used for promotion.

So, she signed, but she's pissed she never got a chance to have it reviewed by her own lawyer -- and worst of all, claims she hasn't been paid a dime for her vocal work.

Dr. Stines is suing Jay and Bey for copyright infringement and violation of her right to publicity ... PLUS damages, of course. She also wants a writing credit, and everything that comes with that ... meaning, cash money.

Snoop Dogg led the way over the weekend -- back in the music biz after months of being sidelined -- shooting a music video at a famed, Sunset Strip burger joint.

Snoop took over Mel's Diner for the shoot, grabbing some food and drink in between takes. Classic cars lined the parking lot as shooting began.

Xzibit and Wiz Khalifa were also part of the shoot ... something we haven't seen here in Hollywood since mid-March.

John Legend was just down the road -- well, maybe 5 miles down the road -- shooing his own music vid in the Los Feliz part of L.A.

TV and film production is back in business, but there are precautions. Among them -- health check for all vendors and others who arrive on set, social distancing restrictions, and requirements for wearing masks.

When actors are shooting scenes, they won't have to wear masks, but otherwise, the mask requirements are pretty much unbending.

Katherine Williams-Dunning, daughter of country music icon Hank Williams, Jr., died Saturday night after losing control of her SUV.

The 27-year-old was driving a Chevy Tahoe in Henry County, Tennessee when it began drifting across the median, triggering a rollover sequence. No other cars were involved.

Katherine was pronounced dead and her husband, 29-year-old Tyler Dunning, was airlifted to a nearby hospital. His condition is unknown.

Katherine's family is country music royalty. Her dad, 71-year-old Hank, Jr., has topped the charts with songs like "All My Rowdy Friends," which is ESPN's "Monday Night Football" theme song. Hank's dad is one of the giants in the history of country music, who died at 29 but produced hit after hit.

Katherine leaves behind her husband and 2 young children.

She was 27.

YG's about to release the music video you could call the fruit of his extensive labor ... pulling together that massive Black Lives Matter rally last weekend in Hollywood.

We're told his new "F**k the Police" vid will drop early Friday, and while the song -- for obvious, lyrical content, reasons -- won't get a lot of radio airplay, you know it'll be all over the Internet. The song itself already has several million plays on YouTube.

As we reported, YG shot much of the music video during Sunday's Hollywood BLM rally, which he helped organize. With an estimated 50,000 people turning out, it was L.A.'s largest protest since George Floyd was killed -- and we're told parts of YG's speech, which kicked off the march, will be featured in the video.

As the Compton rapper said Sunday, "This s**t been going on for too long. I'm tired of waking up, looking at my phone, seeing another one of my people killed by the police."

He added, "I know if my brother Nipsey Hussle was here, he'd be right here with me."

The country music superstars in Lady Antebellum say they've had their eyes opened to the "injustices, inequality and biases" black people have faced, and they're responding by changing their name.

The band is dropping Antebellum and will go by Lady A moving forward, which they say is their nickname with fans anyway. The country trio says they are "deeply sorry" for the pain their name has caused and for "anyone who has felt unsafe, unseen or undervalued."

If you aren't aware, the word antebellum means occurring before the war, but is commonly linked to the period of history before the Civil War ... which, obviously, includes slavery.

The band says they originally chose the name after taking their first group photos at an Antebellum-style home, and because the name reminded them of Southern-style music.

They say the choice of name demonstrates a major blind spot, and they're "regretful and embarrassed" they didn't take it into account.

As for what took them so long ... Lady A is making no excuse, saying all they can do now is fix it and take action going forward.

Ariana Grande is movin' on up ... quite literally 'cause her new pad is up in a very coveted area of the Hollywood Hills.

The singer dropped a cool $13.7 million for this mansion in the famous "Bird Streets" neighborhood ... where just about every resident is a huge celebrity. The home has 4 bedrooms and 7 bathrooms, but ya gotta imagine it's the fitness studio, wellness center and 300-bottle wine cellar that really sealed the deal. Would for us, anyway.

The floor-to-ceiling windows offer some incredible views ... whether you're craving canyon or ocean views, it's designed to take your breath away. Some sick pocket walls open up to an infinity-edge pool, perfect for parties or getting the perfect 'Gram pic.

As if all of that wasn't appealing enough ... it appears Ariana also got a steal. The house reportedly was on the market 2 years ago for $25.5 million and, more recently, for about $17.5.

Blake Shelton's shout-out to a fan's new book -- written in honor of her late daughter -- is giving her a huge emotional pick-me-up, and it ain't bad for sales!

Frankie Williams is the author of "The Merdragon," a fictional children's book she wrote for her daughter, Shauntae, who passed away last year. Shauntae was only 36 and died from undiagnosed heart disease.

Frankie says, at the time, she tweeted at Shelton and his country singer friend Craig Morgan, because Craig had written a song about his son's tragic death. Blake was promoting the tune, "The Father, My Son and The Holy Ghost" ... and she found it very inspiring.

Frankie says Blake replied, saying he was inspired by people like her and Craig who find ways to help others deal with grief while still dealing with their own ... and it motivated her to write the book as a tribute to Shauntae.

Flash forward to Monday -- Frankie tweeted at Shelton saying she wanted to send him a copy of 'Merdragon' as a token of gratitude for his kind words, and he responded again ... saying he'll order it instead.

And, the kicker ... he encouraged all of his 20 million followers to order it, too!

Frankie tells us ever since Blake's tweet, her book's been selling like hotcakes. She says she doesn't have official sales numbers yet, but it's currently in the top 5 in three different children's categories on Amazon ... skyrocketing up the charts from the 400-500 range it was in before Shelton's shout-out.

Coachella 2020 is officially dead on the table -- the music festival will NOT go on in October as previously planned ... with hopes to fire it back up next year.

The news came down Wednesday from Riverside County Public Health Officer Dr. Cameron Kaiser. Kaiser signed an order to cancel the October event citing the fears of another rise in COVID cases in the fall. Stagecoach -- a country music festival held on the same grounds -- is also canceled.

It's still undecided if Coachella organizers will try to bring it back in April -- when it normally runs -- in a limited capacity, or just wait 'til October 2021 to open anew, and welcome everyone.

Another thing that's not totally clear is whether the 2020 lineup will remain the same, or if organizers will try booking new acts for 2021. You'll recall, this year's headliners -- which were supposed to perform later this October after the initial postponement -- included Travis Scott, Frank Ocean, Rage Against the Machine and even a late-game Gaga announcement.

A lot of those artists were already rescheduling shows for 2021, so folks probably saw this coming. Not just that, but Lollapalooza just got canceled too ... and will live stream instead.

Nicki Minaj is going back to the well for what could be her next big hit -- snitching be damned, she's got a new collab with Tekashi 6ix9ine.

The 2 rappers just revealed they worked together on a track called "Trollz," which Nicki says will be released Thursday at midnight. She adds that a portion of proceeds from their project -- including merch items -- will go to The Bail Project Inc.

Minaj and 6ix9ine have been tight for awhile now, and previously worked together on Tekashi's smash hit "FEFE" in July 2018, which featured Nicki. It appears the artwork for "Trollz" has a similar vibe to their last collab too ... as seen on 69's online store.

Only difference to the "FEFE" art is they switched sides ... and replaced an ice cream cone with a lollipop.

Of course, Minaj took some heat after their last collab for continuing to support the rapper when he was arrested in November 2018 on racketeering charges and proceeded to snitch on his former gang members -- along with roping in Cardi B during his testimony -- in order for a reduced sentenced.

It worked, and 6ix9ine was even released early to house arrest due to COVID-19 concerns. He then began to get back to business and back on social media almost immediately ... much to the chagrin of many in the hip-hop world, especially Meek Mill.

So, ya gotta think the Nicki/Tekashi collab's not going to make them any new friends or squash any old beefs ... but that's probably no bother for the "Trollz" team.