Nurse!

"Love & Hip-Hop: Atlanta" star Momma Dee was rushed to the hospital after a scary car accident in Atlanta involving her Uber car service.

MD tells TMZ she was in the back of an Uber on her way home from lunch Thursday afternoon ... when a man in a Nissan struck her ride from behind. Dee says she is in severe pain and believes she's injured her back. An ambulance is taking her to a hospital right now.

Dee says the driver of the Nissan pulled over to exchange his information with her driver, but left the scene before police showed up.

Law enforcement sources confirm one person is being transferred from the accident scene -- and they say the victim made it clear ... she's a celebrity.

Britney Spears went down hard during her Las Vegas show -- falling so hard mid-song ... it was up in the air whether she'd stay down or go on with the show.

She did both -- staying down, and dancing from her backside.

Brit Brit rolled her left ankle pretty good, but managed to keep going through the end of "Crazy."

Her dancers eventually helped her to her feet, and she seemed to walk it off. The fall looks nasty, but Britney assured fans later ... she's ready to get back in the game.

Good news for Kareem Abdul-Jabbar ... the NBA legend has been discharged from the hospital and is now resting at home after a scary medical emergency early Wednesday morning.

TMZ Sports broke the story ... Kareem was rushed to the hospital and was being treated after something went wrong in his recovery from quadruple bypass surgery earlier this month.

Now, a rep for Ronald Reagan UCLA Medical Center is explaining exactly what happened:

"[Thursday morning] Kareem Abdul-Jabbar was experiencing some dizziness following his April 16 quadruple bypass surgery. He contacted his physicians who told him to come to the emergency department at Ronald Reagan UCLA Medical Center."

"He was evaluated by his surgeon and cardiologist. After a battery of tests, they found no complications. Abdul-Jabbar was discharged from the emergency department and is back home continuing his recovery."

"His surgeon, Dr. Richard Shemin, said it is not uncommon for patients to experience some symptoms that require ruling out serious problems following major heart surgery. Shemin added that Abdul-Jabbar did the right thing by coming in to see his doctors."

Kareem Abdul-Jabbar was rushed to an L.A. hospital Wednesday morning for chest pains ... just two hours after he tweeted to fans that he was "feeling better" ... TMZ Sports has learned.

We've confirmed ... someone called 911 to request help for the NBA legend ... who had a quadruple coronary bypass surgery on April 16th.

An ambulance transported Abdul-Jabbar to a nearby hospital where he was treated for chest pains. He's currently being treated by doctors though his condition is unclear.

Just two hours before the 911 call, Abdul-Jabbar posted a message on Twitter to assure his fans that he's "doing fine & feeling better everyday."

He added, "Doing my rehab w/the same mental commitment I had as a pro."

Joni Mitchell is unconscious in a hospital, unable to respond to anyone, with no immediate prospects for getting better.

Joni's close friend of 44 years, Leslie Morris, has just filed legal docs to obtain a conservatorship over the legendary singer. Morris says Joni told her she has no close relatives who could assume the role.

TMZ broke the story, Joni was rushed to the hospital on March 31st, after being found unconscious at her L.A. home. She was taken to UCLA Medical Center, where she remains.

Joni, whose hits include "Big Yellow Taxi," is not responsive to anything. The documents say she's "so impaired as to be incapable of being assessed."

Big Ang is out and about and flaunting new blonde locks ... just a few weeks after undergoing a lifesaving operation to remove a cancerous tumor from her neck.

The "Mob Wives" star was looking good Saturday outside Teak restaurant in Red Bank, NJ, and even stopped to pose with a fan. We're guessing the neckerchief is there to cover any surgery scars -- in the most stylish way possible.

Sources close to Ang tell us she lightened up before the surgery ... because she felt like she just needed a change after getting the cancer diagnosis.

Work it, Ang.

Brad Pitt's face is indestructible -- a fact whoever (or whatever) hit Brad should have known before attempting to disfigure our national treasure.

Brad showed up for a charity event in Hollywood Saturday night with a big bruise that starts under his left eye, and trails under his nose.

Most people would've stayed home with that kind of scarring, but most people don't have BP's genes. No clue what's behind this crime against beauty -- we've got a call in to his rep.

Lil Wayne's tour bus took on gunfire in Atlanta early Sunday morning ... TMZ has learned.

Wayne performed at Compound nightclub on Saturday night ... and sources tell us the shooting went down shortly after 3:30 AM -- minutes after Wayne's 2 tour buses pulled away from the club.

We're told Weezy and a few other Young Money execs and artists -- including Lil Twist and Hood -- were on board at least one of the buses at the time of the shooting. It appears no one was injured, and it's still unclear if Wayne was on board the bus that was hit.

Law enforcement sources tell us immediately after the shooting the bus was driven to a nearby hotel, and that's when someone in Wayne's entourage called cops.

We're told witnesses on the buses didn't see much -- their only description of the suspects is that they were in 2 white vehicles ... a sports car (possibly a Corvette) and an SUV.

"Night Court" star John Larroquette was involved in a brutal car accident that severely injured a reality TV star, who claims he can't get no satisfaction ... from John or his insurance company.

The alleged victim is Joe Meinwieser -- a tattoo artist on Oxygen's "Tattoos After Dark" -- and his list of injuries are horrific: broken ribs, fractured spine, fractured hand, and loss of half his kidney.

Meinwieser claims Larroquette made an illegal turn out of a Venice, CA parking lot in December -- smashing into him and his motorcycle.

Police investigated, and law enforcement sources tell us it's unlikely JL will face criminal charges.

That's not sitting well with Joe -- who claims Larroquette promised to cover his medical expenses ... but the actor's insurance company won't pay up. He says he can't work, and his unpaid medical bills are mounting.

Chris Johnson is FLEXIN' again ... showing off his arm strength last night -- nearly 7 weeks after getting capped in the shoulder in a drive by shooting.

The NFL running back was leaving Hooray Henry's on the Sunset Strip -- when we asked how his recovery has been going ... ever since the incident in Orlando, FL in March 8th which left one person dead.

Chris has been training like a maniac over the past few weeks -- so we had to ask ... where do you want to play next season? His answer is about as honest as it gets.

"Real Housewives of New Jersey" star Amber Marchese is battling cancer for the second time.

Amber's husband tell TMZ, the reality star had surgery earlier this week to remove a lump she found a few weeks ago. Tests revealed the lump was cancerous.

This isn't Amber's first breast cancer battle ... she was diagnosed 6 years ago and had a double mastectomy.

We're told she's understandably scared but a fighter at heart and she believes with positive energy, she will beat it like the time before.

Dalton Gray -- the actor who played Master Mike on "American Horror Story: Freak Show" -- was nearly blinded after an alleged drunk driver plowed into a car he was riding in last weekend.

According to his rep, Dalton -- who also played young Harry in "Dumb and Dumber To" -- was a passenger in his friend's car late Saturday night in Katy, Texas ... when another vehicle t-boned them. 17-year-old Dalton shattered his hip/pelvis and his femur. He also suffered horrific cuts to his face, and some serious eye trauma.

The damage was so bad, doctors had to reconstruct the right side of his face and remove glass from his eye but we're told his vision will recover. Police arrested the alleged drunk driver and as of now, he's currently still in jail.

Gray is the 2nd AHS cast member to be struck by a car in the last few months. Ben Woolf was struck by an SUV while crossing a street in February ... and eventually died from his injuries.

Kylie finally responded to the trend, tweeting, "I'm not here to try & encourage people/young girls to look like me or to think this is the way they should look … I want to encourage people/young girls like me to be YOURSELF & not be afraid to experiment w your look."

The #kyliejennerchallenge has caused some of Kylie Jenner's super fans big problems ... and it's not just their giant lips.

It was bound to happen ... a day after the hashtag blew up online, complaints and pics of disturbing injuries from pissed fans who pushed the limits are now flooding social media.

Before you search #KylieJennerChallengeGoneWrong we have to warn you ... some of the injuries are EXTREMELY GRAPHIC ... ranging from simple bruises to extensive trauma requiring hospitalization.

Keep in mind Kylie never asked anyone to plump up but some of the results have been painful to say the least. Some recent tweets include ... "my lips bleeding and they hurt like hell" and "god help my lips."

The Houston family is now changing their tune, saying Bobbi Kristina is OFF life support, but they continue to maintain there's no real hope for recovery.

The Houston family now tells TMZ, Bobbi Kristina is breathing without the assistance of a ventilator. They say, "According to the doctors she's breathing on her own but the trach has to stay."

But the family still maintains Bobbi Kristina has "global and irreversible brain damage and remains unresponsive."

A pensive Bobby Brown met with doctors Monday to discuss Bobbi Kristina's condition.

Bobby was outside the DeKalb Medical Center in Decatur, Georgia, days after he announced during a concert that Bobbi Kristina was off life support and somewhat responsive. Bobby Brown's rep tells TMZ Bobbi Kristina's condition has improved and doctors say she'll have "a long life," although the quality of life will not be known for years to come.

As we reported, the Houston family says it's not true ... they say she's still on life support and her condition has not changed at all.

We also got this pic of Pat Houston visiting Bobbi Kristina.

Bobbi Kristina is suffering from irreversible global brain damage and is completely unresponsive ... so says her grandmother Cissy Houston.

Cissy tells TMZ, "Meeting with the doctors and understanding that she can live in this condition for a lifetime truly saddens me."

She squarely contradicts Bobby Brown, who claims Bobbi is off life support and somewhat responsive.

Cissy tells us, "I have just returned from visiting my granddaughter Bobbi Kristina in the hospital and while she is no longer in a medically induced coma she has a tracheotomy and according to the doctors she has global and irreversible brain damage and remains unresponsive."

Bobbi Kristina's grandma has faint hope, telling us, "We can only trust in God for a miracle at this time. Keep us in your prayers."