Nurse!

Thinking of being a world-class skier??? Lindsey Vonn might have ya reconsidering ... 'cause she just posted a pic of the knee she tore up flyin' down a mountain -- and it's DISGUSTING.

Vonn -- one of the greatest female skiers ever -- ripped up her knee in a crash during training last November ... and shredded her LCL so badly, she required surgery.

Lindsey says she put off the operation until now 'cause she had some obligations to fill ... and it's pretty easy to see why she waited so long to go under the knife.

The pic of the operation is NASTY ... docs cut open the side of her knee, pulled her skin apart and did everything they could to stitch her ligament back together.

Good news for Lindsey? She says despite the gnarly pic -- surgery went well and she's doing just fine.

Better news for Lindsey? The 34-year-old is retired from competitive skiing now ... which means (hopefully) no more nasty injuries!!!

Jay Glazer gets hit a lot at his MMA gym -- whether it's UFC stars or big name actors, dude gets beat up all the freakin' time ... but who hits the HARDEST??

Star-Lord!!!!

That's right ... Chris Pratt's got the power that'll knock anybody out, so says the Unbreakable Gym owner ... who tells TMZ Sports Pratt straight-up hits harder than the Natural.

"It sucks getting hit by Chris Pratt more than it sucks getting hit by Randy Couture."

UMMM ... HAVE YOU SEEN RANDY COUTURE FIGHT?!?

FYI -- Couture is one bad dude ... he's got a 19-11 record and has 7 knockouts under his belt. Oh, and was a 3-time UFC heavyweight champion!!!

So ... does this mean CP will ditch Hollywood for the Octagon?? Not so fast ...

"He's too busy being happily engaged and pretty."

BONUS -- we also got an update on that tooth Demi Lovato knocked out of Glazer's grill a couple weeks ago ... and super glue really does fix everything!! (We sure hope he's kidding).

The Rolling Stones have pulled the plug on their summer No Filter North American tour because Mick Jagger has health issues.

The Stones announced the cancellation on Facebook, "Unfortunately today the Rolling Stones have had to announce the postponement of their upcoming US / Canada tour dates. We apologize for any inconvenience this causes those who have tickets to shows but wish to reassure fans to hold onto these existing tickets, as they will be valid for the rescheduled dates, which will be announced shortly."

As for why the tour dates were 86'd ... "Mick has been advised by doctors that he cannot go on tour at this time, as he needs medical treatment. The doctors have advised Mick that he is expected to make a complete recovery so that he can get back on stage as soon as possible."

The statement does not disclose the nature of the illness.

The statement ends with a message from Mick ... “I’m so sorry to all our fans in America & Canada with tickets," he said. "I really hate letting you down like this. I’m devastated for having to postpone the tour but I will be working very hard to be back on the road as soon as I can. Once again, huge apologies to everyone.”

This would have been the Stones first North American tour since 2016. It was supposed to fire up April 20 in Miami and end June 29 in Ontario, Canada. The concerts were supposed to dovetail with the release of 10 live tracks.

What's cooler than having the BEST knockdown of the week??

How about getting props from Odell Beckham after the fight?

That's what happened to Lorenzo "Truck" Simpson -- who floored his opponent with a crushing left hook during his nationally televised fight on FS1 this weekend ... making just about every single highlight reel.

Simpson -- one of Floyd Mayweather's prodigies -- was fighting Jaime Meza on Sunday ... and when Mezza threw a stupid, wild spinning punch, Truck timed it perfectly and smashed the dude's face in.

"I caught him real good," Simpson told TMZ Sports with a victorious grin on his face ... "I knew I caught him with a nice shot."

After the fight, Simpson got all sorts of love from big stars including boxing champ Caleb Plant, Gervonta Davis and NFL superstar Odell Beckham Jr. ... who's also a big fight fan.

"It's going nuts right now," Simpson said.

Keep your eye on this dude -- Simpson is 3-0 as a pro ... but he's got BIG power and is on track to be a future superstar in the sport.

Wanna see what it takes to fix a broken face after getting hit with a 98 mph ball???

MLB pitcher Josh Ravin took a screaming line drive to the face while playing for the Atlanta Braves' Triple-A affiliate, Gwinnett Stripers, last June. It was a scary sight ... JR dropped to the ground in pain and had to be carted off the field.

Fast-forward to today ... and Ravin is showing off all the work that had to be put into fixin' his mug after the unfortunate incident ... and it's giving off Terminator vibes!!!

"This photo is the end result.. 5 fractures, a concussion, plastic surgery, 2 plates and 11 screws later," Ravin says, showing off an x-ray of the finished product.

"Here I Am! A bionic, terminator looking human, More determined than ever!..I've always considered myself a 'savage' but I never thought it'd be possible to become an even BIGGER SAVAGE!"

Ravin -- who's a flamethrower with a 99 mph fastball -- had a stint with the L.A. Dodgers before playing with the Braves organization in 2018.

3/11 -- J. Prince just weighed in on the situation ... and the Rap-A-Lot Records CEO is standing up for YBN, who is signed to his record label.

J Prince says ... "mob ties call to my real street n****s around the world, but especially on the East Coast in the Bronx. There's a clown by the name of Zae and his crew who want to become famous by bragging about robbing rap industry n****s. They recently bragged about robbing the artist YBN Almighty Jay, who I'm invested in. They've robbed him of his money and jewelry, including a Rap-A-Lot piece. So therefore they have robbed a piece of me."

"This is a perfect opportunity to execute our unity where we don't allow moment thinkers to muddy the water over the movement. With that being said, to the homies in the Bronx, if any of these clowns are yall's family or friends, speak now so we can get an understanding. To ignore this is a recipe for disaster. Other than that, it's these clowns vs. the realest n****s in every hood around the world and that's the meaning of mob ties."

6:40 PM PT -- Sources close to Lil Tjay tell us ... the rapper had nothing to do with YBN getting jumped later on after the street scuffle. Lil Tjay also shared a message for YBN on Instagram, saying ... "Keep ya head up bro stay strong."

YBN Almighty Jay got his ass handed to him and his chain snatched in an NYC street fight and, unfortunately for him, there's video of the whole beatdown.

The brawl erupted outside a Saks store, of all places ... we're told the 19-year-old rapper was shopping with his pals when another up-and-coming young rapper, named Lil Tjay, walked in with his squad. Witnesses say both sides started squawking, and then it got physical.

The fight spilled out into the street and, at first, it looked like Almighty Jay's side was holding their own. Later, though ... Jay got separated from his homies and you see him getting kicked HARD in the head by at least 2 guys.

We're told the guys who jumped him made off with Jay's wallet, his YBN chain ... and his shoes. Damn. Took the man's shoes.

Police were called, but no one wanted to report a crime.

Street s**t.

A famous stuntman working on CBS' "MacGyver" reboot had a motorcycle jump on set go horribly wrong ... and land him in the hospital.

Regis Harrington pulled the jump Wednesday while shooting a scene in Atlanta ... but a source on set tells us he lost control upon landing. We're told he was immediately rushed to Atlanta Medical Center, where he was under observation in the ICU for a back injury.

The good news is, Regis -- a seasoned vet who's performed stunts for movies like "Logan," "Jurassic World," and "Captain America: Civil War" -- tells us he's gonna be okay.

We got ahold of him on Thursday and there was no bitterness over the stunt gone wrong.

In fact, Regis says he made a mistake while riding ... and he gave the "MacGyver" crew full props for handling the accident with care and professionalism.

CBS confirmed a stunt performer felt pain in his back after a motorcycle stunt and was "transported to a hospital for diagnostic testing."

Regis told us he'd already been released.

UFC rising star Johnny Walker says he's honored Jon Jones wants to fight him down the line -- telling TMZ Sports he's "not scared" to get into the Octagon with the greatest of all time.

Just last week, Jones named Walker as one of the guys he's eyeing to fight in his pursuit of 50 MMA wins.

So, we asked Walker for his thoughts on being on Jones' list -- and the 26-year-old was stoked!!!

"It feels so exciting," Walker told us ... "I feel proud about myself. People start to know me now, this is my dream come true."

Walker says he needs a few more fights under his belt before he's ready to take on a legend like Jones -- but he's definitely not afraid of the challenge.

"I need to beat [3 or 4 more guys] and this will give me more experience and I'll be ready for Jon Jones."

Of course, Walker is coming off of a sensational knockout performance against Misha Cirkunov at UFC 235 -- but suffered a shoulder injury while doing his worm celebration dance.

The good news ... Walker says he can move his arm but admits his shoulder is still "in a little bit of pain."

"I have to go to hospital to check everything," Walker says.

Walker believes he dislocated his shoulder -- but feels it popped back in ... and "aligned to the right place."

Rock 'n' roll icon, Jerry Lee Lewis, was hospitalized after suffering a stroke.

According to a statement from his rep ... the 83-year-old piano-playing legend suffered what doctors call a "minor" stroke Thursday night. He's currently getting treated in a Memphis hospital with family by his side.

Jerry Lee's expected to make a full recovery ... according to his rep, who adds, Jerry "looks forward to getting back into the studio soon to record a gospel record and on the road performing live for his fans."

Lewis reportedly isn't canceling any shows at this point. His next concert is at the New Orleans Jazz & Heritage Festival in April.

Even in his 80s, the "Great Balls of Fire" singer has continued to perform big gigs, including at Stagecoach in 2017 and Chicago's Riot Fest last year.

His rep adds ... "We're just asking for prayers and support and privacy."

Get well, Jerry.

SZA needs to be way more careful when she's scoping out a new pad ... because you never know when an open door to a down staircase will appear.

The singer and her friend, Sage, were in their new house getting some video for their Instagram stories when SZA -- clearly unfamiliar with the lay of the land -- takes a nasty fall.

Check it out ... her friend's recording when SZA squats down, apparently thinking she's still got a wall behind her and leans back too far into the abyss.

It looks pretty bad, but Sage -- despite screaming in horror -- keeps filming and we see SZA at the bottom of the steps ... and she says she's fine.

Probably not the best way to get settled into a new home, but a memorable way ... as long as she didn't hit her head too hard.

Giannis Antetokounmpo says if he was in Zion Williamson's shoes ... he would NOT sit out the rest of the NCAA season -- telling TMZ Sports, "I love basketball too much."

Don't get it twisted ... 24-year-old Giannis isn't throwing shade and says he respects whatever decision Zion makes -- but said he knows what path he would choose.

Zion -- the obvious No. 1 overall pick in the 2019 NBA Draft -- scared the hell out of everyone when he suffered a knee injury during the Duke vs. North Carolina game earlier this month.

He hasn't been back on the court since, and many are wondering if he'll ever suit up for the Blue Devils again ... considering he's got MILLIONS of dollars waiting for him in the NBA.

Giannis says Zion has to do what's best for him.

There's more ... since Giannis was on the court during Ja Rule's doomed halftime performance at the Bucks vs. Timberwolves game on Saturday, we had to ask about the new JA RULE CURSE!!!

Remember, the T-Wolves clowned the disgraced Fyre Festival honcho after his performance was marred by technical issues ... so Ja cursed the team for 30 YEARS!!!

But, Giannis actually has Ja's back -- saying it wasn't the rapper's fault things went south that night, and telling TMZ Sports he still loves the artist.

There's more ... we also asked Giannis if he's paying attention to all the talk about him being in the running for MVP this season -- and of course, the guy couldn't have been more humble.

Giannis is having a monster season -- averaging 27 points a game with 12.6 rebounds and 5.9 assists. BEAST!!!

12:25 PM PT -- Although a family member says Luke was placed in a coma, his rep says he is not. We're told he is sedated.

12:07 PM PT -- Sources connected to Luke tell TMZ doctors have placed him in a medically induced coma. The stroke, we're told, was "massive." When paramedics arrived at his home he was responsive and talking but his condition deteriorated and he was rushed to the hospital.

8:38 AM PT -- A rep for Luke tells TMZ ... he is currently under observation at the hospital.

Luke Perry suffered a massive stroke Wednesday, and is currently hospitalized ... TMZ has learned.

Paramedics responded to Luke's home in Sherman Oaks around 9:40 AM. We know the call came into the fire department for someone suffering a stroke, and Luke was transported to a nearby hospital. It's unclear what his condition is right now.

The 52-year-old who stars as Archie's dad, Fred Andrews, on "Riverdale" ... had been shooting episodes recently in L.A. on the Warner Bros. lot.

Luke's medical crisis coincidentally struck on the very same day Fox announced it will reboot "Beverly Hills, 90210" -- the show on which he shot to fame, playing Dylan McKay in the 90s.

While his former costars -- Jennie Garth, Ian Ziering, Jason Priestly, Brian Austin Green, Tori Spelling and Gabrielle Carteris -- will be on the revived series, Luke has not signed on to the project.

Story developing ...

Rami Malek's big night at the Academy Awards ended with a bang ... of his body tumbling off the very stage where he won his first Oscar! Let's just say the victory lap went bust.

After the ceremony ended, Rami was up on the stage -- possibly posing for a pic -- when he slipped off the edge and fell hard onto the ground in front of the seats.

You can tell he did his best to hold on to the Best Actor statuette he'd just won for his performance in "Bohemian Rhapsody."

You can see how stunned Rami was as paramedics rushed out to the front row to check on him. But ultimately, Rami was more embarrassed than injured -- he did plenty of interviews afterward and seemed fine.

Queen opened the Academy Awards show with "We Will Rock You" -- so, it seems only fitting that the guy who played Freddie Mercury ended the whole night ... by rock 'n' rolling off the stage.

Remember that disgusting bone-snapping injury Bengals tight end Tyler Eifert suffered in 2018???

Dude's doing MUCH better now ... crushing foot drills with a big smile on his face as he preps for his big comeback in 2019!!!

TE suffered a gruesome injury on Sept. 30 against the Falcons, when he got pummeled by linebacker De'Vondre Campbell, who awkwardly fell on Tyler's right ankle and snapped it sideways.

Relive the experience below (or don't. We wouldn't blame you one bit. It's so nasty).

Eifert appears to have put the horrific experience behind him ... rippin' through a set of drills in a workout vid he posted Thursday.

"Looks a lot better than the last time you saw my ankle! #LETSGO," Eifert says.

Nike is vowing to get to the bottom of the shoe fail that caused Zion Williamson's game-ending injury ... wishing the Duke superstar a quick recovery and promising to "identify the issue."

The Swoosh was front and center during the Duke/UNC game Wednesday night after Z-Dub's PG 2.5 shoe fell apart when trying to change directions 30 seconds into the game.

Zion spent the rest of the night in the locker room ... and Coach Mike Krzyzewski says his star is dealing with a right knee strain.

"We are obviously concerned and want to wish Zion a speedy recovery," Nike says.

"The quality and performance of our products are of utmost importance. While this is an isolated occurrence, we are working to identify the issue."

Our Nike sources tell us, brand executives called an emergency meeting Thursday morning to discuss a crisis strategy -- including how to deal with the negative publicity.

One source tells us the brand is obviously embarrassed by the incident -- and some execs are concerned it could cause high profile players to sign shoe deals with rival companies.

One of Nike's competitors has already jumped on the opportunity to throw shade ... with Puma saying, "Wouldn't have happened in the pumas" in a now-deleted tweet.

4:02 PM PT -- A rep for Josie Harris tells us she's also not connected with the project.

10:31 AM PT -- Delicia Cordon also denies involvement with the show. Still, our production sources tell us producers still plan on moving forward with the project.

7:30 AM PT -- Evelyn Lozada's camp tells us she was contacted by producers and had discussions about joining the show, but ultimately turned down their offer to appear in the program.

The woman accusing LeSean McCoy of masterminding a violent robbery at her Georgia home is now trying to take her story to TV ... and she's not alone.

TMZ Sports has learned Delicia Cordon -- along with Evelyn Lozada, Josie Harris and Micaela Sanchez -- are all working on a TV project about surviving abuse.

Cordon is currently suing the NFL running back -- claiming he orchestrated the July 2018 incident when someone broke into her home and pistol-whipped her while stealing valuables. McCoy has denied all wrongdoing.

Evelyn Lozada married NFL star Chad Ochocinco in July 2012 -- but filed for divorce 6 weeks later when he headbutted her during an argument.

Josie Harris was attacked by her baby daddy Floyd Mayweather in 2010. Floyd was convicted and spent 2 months in jail for domestic violence.

Micaela Sanchez has a child with Baltimore Ravens cornerback Jimmy Smith. They're locked in a legal battle because she claims he's been violent towards her. He's adamantly denied her allegations.

We're told the series was partially inspired by "Surviving R. Kelly" -- and producers are still looking for other women to join the project. Sources tell us producers are currently speaking with TV networks and other digital media outlets in hopes of making a deal.