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Post Malone just canceled his Boston concert right before showtime ... and he's citing pain that seems to be carrying over from his fall a week ago.

The singer broke the news a few hours before he was scheduled to take the stage Saturday night at the TD Garden, taking to his socials to explain he was feeling a sharp pain in his side that required him to go to the hospital again.

PM writes, "On tour, I usually wake up around 4 o'clock PM, and today I woke up to a cracking sounds on the right side of my body. I felt so good last night, but today it felt so different than has it before."

He goes on to say he feels a "stabbing pain" every time he moves or breathes, apologizing to his Beantown fans and promising their tickets will be good for another date in the future ... so it sounds like it's been postponed. But at any rate, Post won't perform tonight.

Sounds like there's a lot of confusion (and frustration) on the ground there at the arena ... with different reporters saying that droves of people are now leaving after being told by security as they were waiting to get in that Post Malone had postponed the show.

He's been performing since his tumbling through a hole on stage last weekend and cracking a few of his ribs. PM told fans later that he'd be okay and back on tour soon, but it sounds like he's still not 100%, even now.

Roger Waters needs to know his audience better ... he had scheduled concerts in Poland after essentially blaming Ukraine for the Russian invasion, so now he's decided to pull the plug on the whole thing.

Waters was set to perform at the Tauron Arena in Krakow. Thing is ... it's possible the war could be over by then -- possible. He clearly knows, however, hard feelings would linger so he's 86'd those appearances.

His manager is the one who pulled the plug, although he didn't say why, but it's obvious.

Waters recently wrote a letter to Ukraine's First Lady, Olena Zelenska -- a letter he made public -- claiming "extreme nationalists ... set your country on the path to this disastrous war."

Officials in Krakow had a resolution on the table for the coming week, in which they were about to name Roger persona non grata over his view of the war.

Waters has been on a tear against Ukraine and any country that supported it, including the U.S. for supplying weapons. He also took aim at NATO, which he says provoked Russia.

No one's gonna guarantee you can play guitar like Jimi Hendrix or Elvis Presley, but if nothing else ... ya might be able to decorate your home with the ones they strummed.

The Legends of Rock and Roll auction will go down next month, and some really unique and iconic axes will be up for grabs.

The auction features guitars personally owned or played by some of the biggest rock stars of all time.

Imagine getting your hands on Jimi's Japanese Sunburst electric guitar, which was a gift from his father. It's expected to fetch around $250K!

Kurt Cobain's acoustic guitar comes with an actual estate receipt, while Elvis' 1975 Martin D-28 guitar will also be on the auction block. Bonus for the King's instrument ... it comes with the case too!

The auction will offer some potentially more affordable options too -- guitars from Paul Stanley of KISS, Blink-182's Tom DeLonge and The Cure's Robert Smith.

And, if you're not interested in pretending you're a guitar hero, check out the random memorabilia.

Imagine rocking James Brown's monogrammed dressing room robe and slippers, Rick James' custom-made, and stage-worn, snake jumpsuit ... or Johnny Cash's 14K bracelet and matching ring.

Britney Spears says she may never perform again, but that doesn't mean she won't get in the booth anew -- proven with Elton John ... and maybe, soon, with Benny Blanco.

The award-winning record producer -- who's actually worked with Britney before -- spilled the beans about a possible collab while chatting with radio host Kannon of "Open House Party" -- a nationally-syndicated show famous for playing Top 40 pop songs/fan requests.

In this particular sit-down, Benny touches on the fact that he's recently reached out to BS -- about a month ago, he says -- to see if she might be interested in joining forces again.

Diehard Britney fans might recall ... BB actually helped write and produce her '08 hit record, "Circus" with Dr. Luke -- and it had a successful run at the time on the charts, and actually went on to become her second-highest selling digital single ever. So, yeah ... good results.

Anyway ... listen to what Benny has to say about linking up once more -- it sounds like he's holding his cards close to the vest here, but he makes it clear that both he and Britney have spoken about the possibility of doing something again. Whether she took him up on that, we'll just have to wait and see ... but we know she's not averse to crooning post-conservatorship.

Of course, she lent her vocals to a remix of "Tiny Dancer" recently ... and it did well, even though Britney could hardly be heard on it. So hopefully a Benny collab would just be all her ... assuming she's up for it, that is.

BS recently suggested she'd never hit the stage again ... out of spite, apparently. She says she's so traumatized by the conservatorship, that she wants to stick it to her dad and co.

Elton John's performing at the White House for a TV special ... and a packed house, including celebs, is on hand to see the Rocket Man.

The rock icon says playing the South Lawn at 1600 Pennsylvania Ave. is the coolest venue in his career, calling it the "icing on the cake" ... and he started his set with his hit, "Your Song."

Elton told the crowd it felt wonderful to be among so many folks who have supported his AIDS foundation over the years ... then went to work on the piano.

Billie Jean King was in the house ... and the political power players included President Biden, Jill Biden, Pete Buttigieg and Nancy Pelosi, among others.

The White House streamed opening remarks from Elton, plus his first song before cutting out ... the rest of his performance will air at a later date as a TV special on A&E Networks.

Taylor Swift was, in fact, asked to perform at Super Bowl LVII, TMZ has learned, but turned the offer down ... and we know why.

Sources with direct knowledge of the Super Bowl halftime show tell us ... Swift was approached months ago by SB honchos, asking if she'd headline. We're told Taylor was clear ... she didn't want to perform until she finished rerecording all of her first 6 albums.

As you probably know, back in 2019, Scooter Braun was part of a group that acquired the rights to her first 6 albums. Taylor was pissed, saying she was "sad and grossed out." Braun has since sold the master recordings ... and Taylor vowed to rerecord them to, in effect, regain ownership. She's already rerecorded and released "Red" and "Fearless."

We're told Taylor would like to headline a Super Bowl halftime show, but now it's an issue of timing. It's possible she could finish the remaining 4 albums -- "Taylor Swift," "Speak Now," "1989," and "Reputation" -- in the next year. That would open the possibility of a 2024 appearance, but it all depends on finishing the rerecords.

Taylor Swift fans might think their favorite musician is lined up to play the next Super Bowl Halftime show, but it just ain't true ... TMZ has learned.

Social media was on fire Friday after TS fans thought the NFL dropped a few Easter eggs that hinted at Taylor being the big performer. However, we've spoken to sources with direct knowledge who tell us Taylor's NOT going to be performing at Super Bowl LVII in Arizona.

As for those Easter Eggs, the NFL sent out a press release at midnight announcing Apple Music would take Pepsi's spot as the sponsor of the show. If you're not familiar, Taylor's been making a lot of midnight announcements lately, so fans believed there was a connection.

What's more, Taylor's had a deal in place with Coca-Cola for years, making a Pepsi halftime show impossible ... so with Pepsi out of the picture, fans thought it made sense for Taylor.

Tommy Lee is taking another shot at selling his home in Calabasas ... because he just put it back on the market.

The rock star drummer listed his picturesque estate this week for $4,599,000. It's the same price he listed the home for back in May 2020. It didn't sell the first time so Tommy took it off the market to lease it for a year and has now relisted it.

Tommy's place is 6 bedrooms and 12,000 square feet of pure luxury ... the crib is custom built with all the bells and whistles, including a home theater and a state-of-the art recording studio.

The three-story home features sweeping city views, which are also visible from the private pool and spa.

Tommy's estate is built around a central atrium with a retractable roof ... and there's a concession bar and a wine tasting area.

Adam Levine isn't putting down the mic while he's in hot water over a DM mess -- he's still stepping into the spotlight on stage ... TMZ has learned.

Sources with direct knowledge tell us ... the singer is still scheduled to perform early next month with his band, Maroon 5, at The Shaquille O'Neal Foundation's annual fundraising gala, "The Event" in Vegas.

The gig is set to go down Oct. 1 at the MGM Grand, and we're told the show will go on -- even now, with Adam's relationship status in the headlines amid a DM scandal. Our sources tell us there will be no red carpet at the event, similar to last year, so Adam won't be grilled by reporters.

Not just that, but our sources tell us Adam is also going to forge ahead with other professional commitments he's already made -- and that would seem to include his M5 world tour, with stops all over Asia through the end of the year, as well as one final NYE show in Palm Springs.

It's interesting, considering the drama has now ballooned even beyond what was originally alleged. It all started with one woman claiming she had an affair with Adam, which he denied. She offered up DMs suggesting he wanted to name his unborn kid after her.

Although Adam denied being physically involved, he did cop to sending flirtatious messages and also expressed regret, while noting he's working it out with his wife, Behati Prinsloo.

More women have come forward with claims he was DM'ing them as well -- including some famous ladies alleging he attempted to DM them.

Adam and Behati were photographed together this week, but it's unclear where things stand between them.

At any rate, AL's plowing ahead with his frontman duties.

The U.S. Space Force has released its official song ... and folks online certainly don't appear to be warming up to the new jam.

The military branch unveiled its official tune Tuesday during an Air, Space and Cyber Conference in Maryland titled "Semper Supra", which means "Always Above" in Latin.

One social media user wrote, "Wtf is this? Might as well use the #StarWars theme song! What a joke! #spaceforce". Another guy criticized its "night and day" lyrics saying ... "there is no night or day in outer space..."

FYI, the Space Force was born in 2019, so it was only a matter of time before it adopted an official song like every other military branch.

Of course, this isn't the first time the Space Force raised some eyebrows. You'll recall, it got a lot of backlash in 2020 when the force dropped its camo uniforms. And folks pointed out the fact that it might not be the best idea, when trying to fly under the radar in space.

"American Idol" trio Simon Cowell, Paula Abdul and Randy Jackson are putting the band back together -- at least for today, all in the name of supporting Kelly Clarkson and her new star on the Hollywood Wall of Fame.

The show's OG judges joined the show's very first winner, Monday, during the WOF ceremony ... and it's giving major blast from the past vibes.

In classic fashion, Simon even called out Paula for pulling up late to the whole shebang -- obviously playing around with each other and making light of the situation.

The former judges made sure to flick it up with Kelly at the event. And, it looks like they all couldn't be happier to link up again, especially under such rewarding circumstances ... and she even took a moment to share her excitement with our photog.

You'll recall, Kelly Clarkson was on the very first season of "American Idol" in 2002 and ended up winning the whole thing, which led to her record deal with RCA.

Of course, she's since become a well-decorated pop star and an Emmy-Award-winning talk show host ... and now 20 years later she received her Hollywood star with her judges by her side.

Tim McGraw can rest easy ... if he's in danger of busting his ass, his fans and security will be there for him -- a fairly pain-free lesson he learned in the middle of his latest concert.

Tim was doing a show in Tempe, AZ when he walked to the end of the stage, kneeled down and turned his back to the crowd. The country superstar lost his balance as he went down to one knee, and suddenly ... whoops!!!

It looked to be about a 6-foot fall, at most, but amazingly Tim emerged totally unscathed -- thanks to his security, a fan or 2 and his own athleticism.

Never missing a beat ... he turned the fall into an opportunity to greet some fans up close and personal.

As stage tumbles go ... he got off way easier than Post Malone, who also fell this weekend, and ended up needing some medical treatment.

Post Malone took a super nasty fall onstage ... it was so bad, medics had to help him off and the fans didn't know whether to wait it out or pack it in.

It happened Saturday night in St. Louis at the Enterprise Center halfway through the concert, where he was performing "Circles."

Post was showin' his stuff as he walked down a ramp that extended onto the floor of the arena. It would've gone fine, but there was a hole in the floor that he used to lower his guitar and it hadn't been covered up.

He stepped in it and took an awful fall ... sprawled out on the concert floor. An eyewitness tells TMZ one of his legs was shaking uncontrollably. Medics rushed in and eventually flanked him as he left the stage.

He asked fans to give him a few minutes to collect himself, but clearly, everyone was concerned and some doubtful he'd even return.

15 minutes later, Post resurfaced and performed "Rockstar" and "Cooped Up." "Rockstar" fits because Post was determined to continue even though he clearly was in pain ... clutching his ribs as he sang.

Post thanked the crowd for hangin' in there and told them there was a "big-ass hole in the stage" and even apologized -- not necessary. He finished out the show and even stayed after to sign a few autographs.

No word on his condition ... but he's scheduled to continue his "Twelve Carat Tour" in Columbus Sunday.

Lady Gaga was sobbing Saturday night, after Mother Nature decided to put an end to her concert in progress in Miami.

The weather was awful ... pissing rain and lightning as she plowed along onstage, but it was just too much.

The Miami Hard Rock Stadium concert was the final show in The Chromatica Ball Tour.

Gaga lost it as she apologized to her IG fans ... saying in part, "I've always wanted to be like that hardcore, bad bitch, but what I really want is to also be responsible and loving and I don't know what I would do if anything happened to anybody in the audience or to any member of my crew, my band, my dancers."

She went on ... "So I'm sorry that we didn't get to do the epic performance of 'Rain On Me' in the rain but what's more worth it to me is life, and to whoever threw these to me on stage [the roses] I will cherish them forever."

Rihanna and A$AP Rocky hit the studio Friday night ... adding more fuel to the rumor mill she's gonna drop another album!

She's been seen at the L.A. studio several times recently, so the seemingly endless wait for more music may be coming to an end.

RiRi was there with BF A$AP, who is mounting an aggressive defense to weapons charges. He's been hit with felony firearms charges for allegedly shooting A$AP Relli. Relli has filed a civil suit against Rocky as well.

Rocky's new lawyer, Joe Tacopina, told TMZ Friday, "Rocky didn't commit a crime. It was an extortion attempt by a former associate, who threatened to make false criminal accusations if Rocky didn't pay him."

Tacopina tells us he has 2 eyewitnesses who back Rocky's story ... not only that Relli wasn't hit by bullet fragments, but that no shot was even fired. In other words, Tacopina says Relli has made up the story in a "get rich quick scheme."

Britney Spears isn't afraid to shed a few tears ... even while she's on camera -- but she insists this cry session isn't about being sad, it's more of a catharsis.

The pop star posted a clip of herself at the crib Tuesday, where she was spinning around to some earthy tunes playing in the background. Nothing really new there -- except this time, she started weeping toward the end ... kinda out of nowhere.

Now, it appears BS knew people might be alarmed by her crying, because she got ahead of it ... noting in her caption that she was not having a breakdown here, per se, but simply letting out emotions.

Brit said, "It’s been a while since I’ve cried on camera !!! It’s not a breakdown assholes, it’s a release that I’ve needed for a very long time now !!! Spiritual experience for sure !!! I think I need to do that way more 🌹🌹🌹 !!! Psss… bawling."

Unclear if Britney was moved by the music/dancing ... or if it's related to her conservatorship, or even both. What we do know is she's aware there are more eyes on her now as she continues to feud with her sons ... while also taking shots at contemporaries of hers, like Christina Aguilera -- who she kinda fat-shamed this week.

You might've heard about this one too ... Britney posted a quote from Rodney Dangerfield on IG that read, "I found there was only one way to look thin: hang out with fat people." She furthered that thought by name-dropping Christina and her backup dancers, saying if she had those same peeps in her orbit during the peak of her fame ... she'd look "extremely small."

Britney caught A LOT of backlash from that, with many taking it as body shaming ... but she defended herself in a follow-up post by insisting she wasn't trying to put anyone down, and that she'd been misunderstood. In any case, Christina unfollowed her as a result.