Nurse!

Katie May, a hugely popular Playboy model and social media sensation, suffered a "catastrophic" stroke ... according to her family.

May, known as MsKatieMay on the Internet, is hospitalized in critical condition after suffering the stroke Monday in Los Angeles. We're told she'd recently complained of neck pain and sought treatment. Her family tells us the devastating stroke was caused by a blockage in her carotid artery.

There have been rampant rumors on the Internet that Katie died. People have been posting R.I.P. across all her social media sites. She's only in her mid 30s, so the stroke is especially shocking.

Known as the "Queen of Snapchat" ... she's modeled for Playboy and Sports Illustrated. She has almost 2 million followers on Instagram alone.

Katie has a 7-year-old daughter, and the family has started a gofundme page to support the little girl. We don't know Katie's prognosis yet, but it seems grim.

She captioned her last IG post, "Hope everyone is having a great Monday! It's very windy here today in LA."

Seems Michael Schumacher's health has taken another turn for the worse -- so says his former Ferrari boss who gave a cryptic update about the 7-time Formula One champ.

"I have news and unfortunately it is not good," said Luca di Montezemolo, the former president of Ferrari.

Luca didn't get into specifics when addressing reporters Thursday.

Awesome moment Tuesday courtesy of Vernon Davis -- when he surprised a hardcore Broncos fan at a Children's Hospital near the Super Bowl ... and the fan was so excited, he could barely talk!

It all went down at Stanford Children's Health -- where Alex -- an 18-year-old Broncos fan -- has been courageously battling cancer and heart problems since he was 5 years old.

We're told the hospital tweeted out to several Broncos players asking if anyone could stop by -- and lo and behold, the tweets got to Vernon's people.

The tight end immediately cleared his schedule and made plans to go to the hospital -- what ensued was a pretty special moment.

We spoke with a rep for the hospital who tells us the two talked about everything from the Super Bowl to what Peyton Manning is like in real life. The two also took pics together and Vernon signed a football.

In the end, we're told the experience was a "dream come true" for Alex.

Pretty cool.

"Mob Wives" star Big Ang is in dire straits in her fight against stage 4 lung and brain cancer so her family is turning to marijuana as a last resort.

Ang didn't respond to the chemo treatments she started after the New Year, in fact her family says one of the tumors got bigger. Her sister Janine tells us Ang isn't on her deathbed, but her breathing is labored and she's in a lot of pain.

They've decided to try managing her pain with cannabis oil. Some patients believe the alternative treatment can even shrink tumors (that hasn't been scientifically proven) -- but it ain't cheap, going for as much as $60 per gram. The family is raising money via a GoFundMe page.

Ang is too tired to do anything, but Janine is hoping the cannabis oil will at least keep her pain-free.

Dr. Oz is getting called out again over a "magic weight-loss cure" he touted on his TV show ... this time in a class action lawsuit.

The suit is all over weight loss supplements containing Garcinia Cambogia ... which is green coffee bean extract. They're sold by a company called Labrada, and Dr. Oz covered the products on an episode called "Five Biggest Fat Busters for Five Body Types in Just Five Days."

The suit, filed by a consumer on behalf of all purchasers, says Oz described Garcinia Cambogia as a revolutionary fat buster which "could be the magic ingredient that lets you lose weight without diet or exercise." The suit says the "Oz Effect" caused sales to skyrocket.

Oz already had to testify about this product for a Senate panel in 2014, and during the grilling he leaned on evidence from a scientific study. But the lawsuit points out that study has since been discredited.

According to the suit, "all credible scientific evidence" shows Garcinia Cambogia simply doesn't work. The plaintiffs are going after Oz, Labrada, Harpo Productions and others to get their money back plus damages.

Former NBA star Jayson Williams -- the guy who shot and killed his limo driver in 2002 -- was arrested in Upstate NY last week after cops say he drunkenly crashed his Jeep into a utility pole.

Officials say emergency responders were called around 11:30 PM on Jan. 26th to a single car crash -- and found the 47-year-old in his banged up Jeep.

Williams was transported to a local hospital to be treated for injuries -- and was ultimately charged with misdemeanor driving while intoxicated. You can see scrapes on his face in the mug shot.

Williams was released from the hospital a short time later.

"American Hot Rod" star Duane Mayer has become the poster boy for the consequences of drunk driving.

Duane, who now operates his own shop under the "American Hot Rod" name, was hospitalized New Year's Day after being arrested for drunk driving.

Cops say Duane was so wasted he fell out of a 1932 Ford Coupe while it was still moving ... at around 25 mph. His injuries are gnarly.

Photos of the wrecked pre-war Ford appeared on the Anaheim Police Department's Facebook page with the warning, "Always designate a driver when drinking."

We reached out to Duane, who had no comment.

Uber, Duane.

TMZ Sports has obtained photos of the bloody scene at Marco Pappa's apartment -- after the MLS player was stabbed ... showing a bloody knife and a blood trail from the kitchen to the bathroom.

Justin Bieber literally helped a little old woman get across the street ... after she was involved in an alleged hit-and-run accident.

Bieber and his pals were bar hopping Wednesday night -- leaving The Nice Guy in WeHo for Warwick -- when law enforcement sources tell us his crew passed a woman shouting in the street.

They pulled over to help -- we're told Biebs tried to console the woman while his friends flagged down cops. She told officers she simply fell down, but several witnesses say a black SUV sped away and it appeared to be a hit-and-run. The lady refused medical attention when ambulances arrived.

Justin's got a knack -- he also raced to aid Floyd Mayweather's kids after they were in a car accident.

Kristin Cavallari's nursing a bum wing after her car accident in Chicago, and the poor girl desperately needs a win.

It's been a rough couple of months for Kristin -- after dealing with her brother's death in December ... she got hit by another driver in Chicago last week. As she said to the photog at LAX on Monday ... "I'm just happy it wasn't worse."

Rob Kardashian is in a vulnerable place right now and Blac Chyna not only knows it, she's taking full advantage ... according to people in Rob's inner circle.

Sources tell us Rob's close friends and family members tell us he's dealing with so much right now -- his ongoing weight issues and his recent diabetes diagnosis -- and they think BC made her move now, because his guard is down.

We're told they think Chyna really only wants 2 things: publicity and to get back at Kylie Jenner for hooking up with BC's baby daddy, Tyga.

Our sources say Rob's peeps think the fact Chyna's BFF Amber Rose just started following Scott Disick on IG ... is more proof this is a full scale "thirsty" attack.

They're all for Rob "having some fun" -- but they just hope he sees BC for what she is.

Jason Pierre-Paul just posted a photo that was taken at his hospital bedside on July 5th -- one day after the fireworks accident that blew up his hand.

JPP wrote, "July 5th I remember."

In the pic, you can see the NY Giants star elevating his right arm -- which is heavily wrapped up and red from the bleeding. You can also see blood on his hospital gown.

Miraculously, JPP not only recovered from the injury -- but eventually got back on the field and played with the Giants ... turning out a pretty impressive performance considering the circumstances.

In fact, the last time we spoke with JPP, he was in such good spirits about his situation -- he even joked about not being able to play video games anymore.

Kristin Cavallari was taken to a hospital outside Chicago after a car wreck.

Sources close to the reality star say she was in a vehicle that was struck by another driver Thursday afternoon. A witness tells us Cavallari's husband, Jay Cutler, showed up at the hospital shortly after she got there.

We're told Kristin's injuries aren't serious but she's sore. Her 3 kids weren't with her during the accident -- our source says cops are at the hospital to take a report.

"Little Women: LA" cast member Christy McGinity Gibel is in the hospital after a brutal attack by two of her cast mates.

The attack went down at Borderline Bar & Grill in Thousand Oaks, CA over the weekend while the cast was filming season 4. It's unclear what started the brawl, but Christy left with 2 brain contusions.

Christy couldn't shake the headache, so she checked herself into Cedars-Sinai Medical Center.

No word on what triggered the brawl... our source says the ladies were drinking iced tea, so alcohol doesn't appear to be a factor. We haven't been told which cast members brawled with Christy.

We got Christy's husband Todd as they left the hospital. He says she'll pull through, but she'll feel the effects for months.

Jason Mraz got in a serious accident after a driver sped through a red light and crashed into him.

The other driver t-boned Jason's car and then spun 90 degrees, striking another car.

Jason complained of neck pain but didn't go to the hospital. The female passenger in his car had more serious neck pain and was taken by ambulance to Tri-City Medical Center in Oceanside.

Jason had just left Home Depot when he got hit.

Rob Kardashian's diabetes diagnosis did not scare him healthy ... not by a long shot ... and his family is worried sick if he doesn't radically change his ways he could die.

Our Kardashian sources tell us they were confident after Rob was admitted to the hospital late last month and diagnosed with type 2 diabetes he'd begin eating healthy, exercising and doing whatever it took to beat the disease.

It's so bad, Rob has to give himself insulin injections once a day ... but he's still unfazed by the scare.

Our sources say he's still eating crap and not seriously doing anything to lose weight.

We're told Kris and Rob's sisters have stepped up and hired a full-time chef who specializes in diabetes diets to prepare all of his meals. They've also hired a nutritionist and trainer.