Nurse!

Kelly Osbourne's seizure may have been much more serious than first suspected, because doctors say she could be suffering from epilepsy.

Kelly has been hospitalized since suffering a seizure Thursday on the set of "Fashion Police." Sources connected with Kelly tell TMZ ... the seizure was far more serious than first suspected. Doctors are running tests and we're told she'll be in the hospital for at least a few more days.

We're told doctors say there's a real possibility that Kelly is an epileptic, but it's possible it was an isolated incident. If it's the latter, docs need to figure out what happened and how they can prevent another episode.

5:50 AM PT -- We're told Justin has been released from the hospital. He feels crappy, but still plans on going ahead with tonight's show.

Justin Bieber was taken to a hospital in London moments ago ... after collapsing backstage during a concert ... TMZ has learned.

A source close to Justin tells us the singer felt woozy during the show at the O2 Arena ... and with 4 songs to go, he stumbled backstage where he collapsed.

We're told the singer was pulled into a private room where he was treated with oxygen from emergency personnel.

Sources say Bieber was advised to go to the hospital ... but declined ... insisting that he "had to finish the show for his fans."

That's when Bieber's rep, Scooter Braun, went on stage and told the crowd ... "Justin's got very light breath. The whole show he’s been complaining, He’s backstage with the EMTs and the doctor."

A short time later, JB returned to the stage ... completed the show ... and got a HUGE ovation.

Justin was transported to the hospital directly following the show ... and we're told he's still there receiving treatment.

We're told he's in good spirits and feels OK ... but doctors want to evaluate him.

Valerie Harper is refusing to go gently into that good night ... continuing to go out in public and live her life after being diagnosed with terminal brain cancer.

The "Mary Tyler Moore" actress was pictured out in Santa Monica early Thursday morning with her husband of 26 years Tony Cacciotti ... sporting a brave face.

Earlier this week, 73-year-old Harper revealed she has leptomeningeal carcinomatosis, a rare form of cancer in which cancer cells spread into the membrane surrounding the brain.

Rage against the dying of the light.

Kim Kardashian went to the doctor yesterday because she was having pains in her stomach, and the doc warned she needed to slow down.

We're told Kim was flying home from Paris when she started feeling "severe stomach pains" on the plane. It freaked her out and she started bawling in front of other passengers.

Sources say Kim is "stressed out" ... we're told because she's prepping for her deposition in her divorce case with Kris Humphries and she's moving to a new house.

When Kim landed she went to her doctor, who told her she had flu-like symptoms and it was not a miscarriage warning.

We're told the baby's fine. In related news, we're told Kris Kardashian has already signed her.

Just three days before Paul Bearer died, he complained he was suffering a blood clot ... TMZ has learned.

"Cowboy" Bob Kelly -- one of the board members of a prominent wrestling society called the Cauliflower Alley Club -- tells TMZ he last saw Paul on March 2nd at a Club reunion.

Bob says Paul was in bad health, with a severe breathing problem. According to people at the event, Bearer was coughing and had trouble standing for long periods of time. He told people he was going to seek treatment for what he called "respiratory issues."

Bob says Paul went to the hospital immediately following the reunion.

Bob says he was later informed the famed wrestling manager was being treated for a blood clot.

Valerie Harper has terminal brain cancer and doctors are giving her around 3 months to live.

Harper, who famously played the character Rhoda on "The Mary Tyler Moore Show" and the spin-off, "Rhoda," was diagnosed with leptomeningeal carcinomatosis, a rare form of cancer in which cancer cells spread into the membrane surrounding the brain.

Harper, 73, told People, "I don't think of dying. I think of being here now."

Venezuelan president Hugo Chavez has died ... this according to Venezuelan Vice President Nicolas Maduro.

Maduro -- who was fighting back tears during the announcement -- said Chavez died today at 4:25 PM.

Chavez had been in Cuba for months, where he was receiving treatment for a mystery illness that turned out to be cancer.

Chavez hated America ... and blamed all of the world's problems on the United States.

To paraphrase Ben Affleck ... Hugo f**k yourself.

He was 58.

Don Pardo was conspicuously absent from the opening credits of "Saturday Night Live" last night ... and TMZ has learned it's because he recently suffered a broken hip.

"SNL" fans immediately noticed the voice that announced the cast last was NOT that of Pardo's ... despite the poor attempt at an impression.

But rest assured, Pardo is ok ... our sources say he is recovering from a broken hip and doing just fine.

Should have taken the stairs ... three "Modern Family" stars had to be rescued by the Kansas City Fire department Friday -- after getting trapped in an elevator for an hour!!!

Julie Bowen, Eric Stonestreet and Jesse Tyler Ferguson were on their way to a fundraiser for the Boys & Girls Club at the Sheraton Kansas City Hotel, but got delayed when their elevator broke down, according to the Kansas City Star.

While trapped, the actors snapped a photo of the ordeal and posted it on Twitter while waiting for firemen rescue them.

According to the report, the Kansas City Fire Department freed them after about an hour and the threesome made it to the event (which they were headliners for) an hour late, but full of "hey we just got stuck in an elevator" jokes.

A man was gunned down in Philadelphia Thursday night ... right next to the tour bus of rapper French Montana.

Montana -- who's done songs with Drake, Lil Wayne and Rick Ross -- was in his tour bus after the performance ... when it pulled up to a Holiday Inn Express with a bunch of fans following closely behind. Cops say that's when a car drove by and opened fire on the crowd.

Two men were hit, including a 27-year-old who was pronounced dead a short time later. A 29-year-old was shot in the shoulder, but he should be okay.

Police say it doesn’t look like Montana or any of his people were the targets ... it seems to have been a beef between two groups of warring fans.

Porn star Jessica Bangkok just got 86'd -- no, it's not a sexual position -- she got fired for letting a guy known to have had Syphilis have sex on her radio show.

Sources connected to Radio Sex -- a SiriusXM channel -- tell us Jessica, along with legendary porn stars Debi Diamond and Nicki Hunter all got the hook this week after the channel's owner launched an investigation into Jessica's show, "Real Life Stories."

The guy with the alleged STD is Mr. Marcus. Pics of his on-air sexual escapade surfaced on social media, and the suits at Manwin USA -- which owns Radio Sex -- went crazy.

We're told even though it's a sex show, no one is allowed to have sex in studio. Company policy not only prohibits it, they don't have the necessary permits to screw on air.

But an even bigger issue is the whole Syphilis thing. Mr. Marcus -- a porn star himself -- hid the fact he had the STD last year, and had sex with a bunch of porn stars. When word got out, the industry shut down for more than a month while everyone was tested.

The honchos at the radio station were livid that Jessica knew of Mr. Marcus' history yet let him do the dirty in studio. (To be clear, Marcus isn't accused of boning Jessica or the other porn stars in the studio. He's accused of banging a non-porn star guest he brought in.)

During their investigation, the honchos also discovered Debi and Nicki were doing sexual things on the air which is a big no-no. So they also got the axe.

In case you're a fan ... that's why all the shows have been in reruns this week.

Honey Boo Boo's dad is in danger of getting his redneck card pulled -- 'cause TMZ has learned Sugar Bear's health is forcing him to cut out ... FRIED FOOD!!!

Sugar Bear was released from the hospital on Thursday after checking in last week with severe chest pains. Doctors diagnosed him with pancreatitis.

Mama June tells us Sugar's “feeling pretty good, for the most part” -- and doctors say if he takes his meds he should be able to keep flare-ups under control.

But June says doctors also advised Sugar to lay off fried and spicy foods -- no small feat for anyone living in the deep south.

June says the family plans to eat the same stuff they'd normally eat -- which ain't exactly Lean Cuisine -- and Sugar will just have to sit out on fried chicken nights.

The lead singer of Los Lonely Boys -- the band responsible for the hit 2003 song "Heaven" -- is currently holed up in an L.A. hospital ... after taking a nasty fall off stage following a concert last night.

According to the band's rep, the Boys had just finished their set when singer Henry Garza tried to greet some fans, but misjudged his step and toppled off the stage ... falling right into the orchestra pit.

We're told Henry's bandmate and brother, Joey Garza, immediately jumped down to his aid ... and Henry was transported to a local hospital.

The band was forced to cancel three performances in Hawaii this weekend as a result of the fall.

According to the rep, Henry's expected to recover just fine -- it appears there was no long-term damage done. It's currently unclear when the band will go back on the road.

Long-term brain damage remains a serious issue among NFL players ... and the league still has LOTS of work to do in order to fix it ... so says New Orleans Saints QB Drew Brees.

Brees said, "I think it's a major issue. It's something that we need to continue to put research [into] and treatment protocols at the forefront to try to find ways to treat guys that have those long-term head and neck injuries when they leave this game."

He added, "It is definitely a serious problem."

You'll recall, pro football has recently come under intense scrutiny for its long-term health risks -- following the high-profile suicides of several NFL stars like Junior Seau. The deaths have been attributed to a brain disease stemming from injuries the players sustained during their careers.

Last week, Adrian Peterson -- one of the greatest running backs of all time -- said he would never let his son play the game.

Even President Obama has said he would have to think twice about whether he would let a son of his play football due to the health risks.

An award-winning TV and film director was killed in a gruesome shark attack off the coast of New Zealand today ... as authorities grabbed guns and opened fire on the animals.

46-year-old Adam Strange -- who's directed a whole bunch of international commercials for companies like Pepsi and Firestone -- was swimming at a popular NZ beach when a Great White pulled him underwater. According to local reports, at least 3 other sharks were drawn to the attack.

Local police jumped in a small boat and raced over to the scene ... joined by a helicopter. The cops fired at least 20 shots at the sharks, but it was too late.

One shark was reportedly killed in the gunfire ... and its body -- measuring 14-feet long -- washed up on shore a short time later.

As for Strange -- authorities were able to recover his body after the attack.