Nurse!

Maura Tierney appeared feeble and frail a day after her scary cycling accident where a car hit her on the road ... but the good news is that she's on her feet and walking.

"The Affair" star was spotted Tuesday walking gingerly with assistance as she headed down some steps. Maura's left arm was wrapped almost entirely with a protective bandage, presumably covering up an injury suffered Monday in Marina del Rey.

She was seen later walking around the block under her own power.

TMZ broke the story ... the former "ER" star's back wheel was clipped by a car while riding near the ocean. She was sent flying to the ground and was eventually transported to the hospital. She was released with no major injuries, but you can tell she's still feeling it.

Cops say they don't believe alcohol or drugs were a factor. The driver even stayed on the scene while Maura was being treated.

Swae Lee was left bleeding and livid after a fan threw something on stage at a concert he was performing at this weekend ... which riled him up enough to threaten to sue.

The Rae Sremmurd rapper was opening for Wiz Khalifa Sunday night at the Starplex Pavilion in Dallas, when at one point a fan threw an object on stage "like a baseball" that smacked Swae in the face and busted his lip open. It also might've knocked out his tooth, as he indicated himself.

It's unclear what exactly the object was, but some eyewitnesses are saying it was either a phone or a wallet, because it contained an ID inside that Swae was trying to read aloud in getting a name for the perpetrator. He was stopped by people around him, including bandmate Slim Jxmmi who tried to drag him away. It's pretty clear though ... Swae wanted the person's info, and he wanted folks to see his injury.

He asked cameras to zoom in on his face, and they obliged. Needless to say, it looked pretty gruesome. His mic was eventually cut off and he stormed off stage in a rage.

Swae later tweeted about the incident, saying the fan was a girl ... and that the injury was bad enough to keep him off tour for at least a few days.

The 14 or so people injured by a tent collapse before a Backstreet Boys concert this weekend are lucky to be alive based on this woman's first-hand account of the accident ... which sounds terrifying.

We spoke with Oklahoma resident Rhonda Dunn, who was one of the at least 14 victims injured at the WinStar World Casino and Resort Saturday after an awning fell on people waiting in line. She recounts the moment the tent collapsed ... fighting back tears to do so.

According to Rhonda, she was pinned under the structure before some heroic bystanders helped lift enough of it for her to get out. She didn't walk away unscathed though -- Rhonda tells us a doctor told her she'd suffered a compression fracture on her spine.

IndyCar driver Robert Wickens was just taken to a hospital by helicopter after a horrifying crash he was involved in on the track ... which sent him and his vehicle spiraling.

Wickens was racing Sunday at Pocono Raceway in Pennsylvania for the ABC Supply 500 Series when he tried passing another driver, Ryan Hunter-Reay, on lap 6 ... but bumped him instead, and got launched into the air and against the side fence in a terrifying collision.

According to IndyCar Series' official Twitter account, Wickens was awake and alert as he was being transported to nearby Lehigh Valley Hospital-Cedar Crest. At least 4 other drivers involved in the wreck were reportedly being treated on the scene as well.

The rest of the race is currently delayed, but it's expected to resume as soon as debris is cleared from the track.

We're so used to seeing Teyana Taylor absolutely SLAY when she's busting a move ... except when she runs out of real estate, which is what led to a nasty-looking tumble off stage.

The crazy fall went down at PlayStation Theater in NYC where she was performing her set in the tour formerly known as the Later That Night tour (more on that in a bit). You see Teyana doing what she does best -- move her body -- when, outta nowhere, BAM ... she slips.

You can see her left foot lose grip ... and though it looked like an awkward fall (that right knee appears to bend like no knee should ever bend), Teyana quickly gets up and doesn't skip a beat.

Unclear if hubby and NBA player Iman Shumpert was in the crowd during the tumble.

Shonda Rhimes hasn't had a misstep in her career, which is more than can be said about a world-renowned physician who tripped and fell in front of her house, and now the good doc is suing her.

Dr. Kuo Chao claims in a new lawsuit, he was jogging past Shonda's Hancock Park mansion in L.A. back in June 2017, when he tripped over a buckling sidewalk in front of the 8,400 square foot home.

He says he broke his wrist, damaged cartilage and lost range of motion and function in his wrist and arm, which has caused limited mobility and loss of strength and stamina. He also says he has lost "fine motor skills." He says he was unable to work for a long time and it still affects his ability to work.

Dr. Chao says he is a prestigious interventional neuroradiologist -- he treats stroke and aneurysm patients. He graduated Summa Cum Laude from Yale.

As for why Dr. Chao says Shonda's responsible, he says she had an obligation to fix the sidewalk, which buckled due to pipes, tree roots and botched repairs. He's also suing the City of L.A.

Dr. Chao is asking for unspecified damages.

Lance Armstrong wrecked his bike on a cycling trail in Colorado on Wednesday -- and bashed up his face so badly, he went to the hospital for treatment.

"Well, sometimes you’re the hammer and sometimes you’re the nail," Lance said ... while posting a photo of his bloodied face.

Lance was riding on the Tom Blake dirt trail in Snowmass Village in Aspen when he fell ... hard.

"Took quite the blow to the noggin’ so swung by the Aspen Valley Hospital (great facility!) to get my head checked."

Lance says he was checked out by an Emergency Room doc -- but appears to be okay now.

The former Tour De France champ also says he wouldn't have gone to get his head checked back in his younger days, but now that he's 46 (older and wiser) he takes possible brain injuries MUCH more seriously.

Matthew Perry underwent surgery to deal with a serious health scare stemming from his digestive tract.

Perry's reps confirmed to TMZ that the former "Friends" star recently had surgery in an L.A. hospital to repair a gastrointestinal perforation, which is essentially a hole that forms anywhere between the throat and the rectum -- but typically in the stomach, large bowel or small intestine.

It can be triggered by anything from appendicitis or diverticulitis to a knife or gunshot wound. Medical sites say it needs to be immediately treated or it can be life-threatening.

8/6 -- A source close to Kendall tells us her dog never made contact with the child -- it was startled by the little girl -- and it never bit her. We're told Kendall didn't leave the deli until she was sure the dog didn't bite the girl as there were no physical injuries.

Kendall Jenner had cops called on her this weekend while out with her boyfriend, Ben Simmons, after her dog allegedly bit a little girl.

Law enforcement sources tell us a call to LAPD came in Sunday morning regarding a dog bite at the Beverly Glen Deli in L.A. that was allegedly inflicted by Kendall's Doberman Pinscher.

We're told a mother and her young daughter were eating on the patio of the restaurant -- where Kendall and Ben were also seated -- when for some reason her harnessed dog nipped the girl. Sources say there were no obvious puncture wounds from the bite, so the deli's staff simply administered ice from inside for her injury.

We're told when the mother came back outside to confront Kendall and Ben, they'd already paid their bill and vanished -- leaving behind no contact info or note.

Gotta respect Tamra Judge's hot tub game -- get drunk, get naked and dive right in, baby! She just sucks hard at sticking the landing.

The 'Real Housewives of Orange County' crew was down in Mexico on Monday night's episode, and things got pretty wild when Tamra and Shannon Beador decided to hop in the tub. Tamra just decided to do it in the nude.

Like we said, she's got hot tub game! TJ even flaunted her bod outside the tub, but watch ... the plot twist came when she tried to jump back into it, apparently breaking her foot.

Lindsay Lohan's new reality show with MTV is already hobbled -- 'cause its star is nursing a bum wheel.

Lindsay was in Mykonos, Greece Monday with a large brace wrapped around her right ankle and foot. It's unclear if she injured herself while filming "Lohan Beach Club" -- the new reality show MTV just announced.

Either way, LiLo doesn't look too comfortable with the foot gear. Hard to tell if or how this might affect production on her reality show. So far, so good ... camera crews were still front and center as she made her way around the club.

Also interesting ... Linds seemed to be walking around just fine in the newly released promo for the show -- which makes us think the injury is recent, and will probably (most definitely) be included as a plot point in at least one of the episodes.

Convicted child molester Larry Nassar was attacked in prison by another inmate and injured ... this according to his attorney.

Nassar is currently serving 40 to 175 years in prison for sexually assaulting more than 150 women and girls while serving as a doctor for Michigan State University and Team USA gymnastics.

According to court docs filed by his public defender, Jacqueline McCann, Nassar was assaulted within hours of being released into the general population back in May at the United States Penitentiary in Tucson, AZ.

Nassar apparently suffered injuries in the attack -- but the details surrounding the incident are unclear at this point.

Interestingly, Nassar's attorney is accusing the judge in his criminal case of essentially inciting the violence -- claiming the way she oversaw the proceedings empowered inmates to attack him.

McCann references specific quotes from the hearing in which Judge Rosemarie Aquilina "proclaimed, with apparent relish, that she was signing his 'death warrant.'"

In court docs, McCann says, "Unfortunately, Judge Aquilina's comments and conducting of the sentencing proceeding appeared to encourage this type of behavior."

Now, it seems Nassar could be moved to another prison.

5:31 PM PT -- Demi's rep tells TMZ, "Demi is awake and with her family who want to express thanks to everytone for the love, prayers and support. Some of the information being reported is incorrect and they respectfully ask for privacy ... "

3:13 PM PT -- Demi's aunt, Kerissa Dunn, posted on social media that Demi is "awake and responsive."

1:48 PM PT -- Paramedics found Demi unconscious when they arrived at her home.

1:28 PM PT -- Law enforcement sources tell us Demi was treated with Narcan -- an emergency treatment for narcotic overdoses -- at her home. We've confirmed the OD occurred at her house in the Hollywood Hills.

Demi was out Monday night celebrating a friend's birthday in West Hollywood, and we're told she posted photos on her private Instagram of herself and others in the group. She seemed happy in the pics.

Demi Lovato was rushed to an L.A. hospital after suffering what appears to be a heroin overdose, law enforcement tells TMZ.

Our sources say Demi was transported by ambulance from a home in the Hollywood Hills just before noon Tuesday, and is currently being treated. We do not know her condition.

Demi has fought substance abuse for years ... at one point she lived in a sober living home after getting released from a treatment center. She had been 6 years sober from alcohol, cocaine and Oxycontin.

Last month she released a song called "Sober" where she revealed she had fallen off the wagon.

Demi just performed on Sunday at the California Mid-State Fair in Paso Robles with Iggy Azalea.

She was scheduled to go on the road this week for an upcoming show in Atlantic City, but our sources say she's been struggling.

Hall of Fame jockey Victor Espinoza was sent to the hospital this weekend after a horse he was riding died on the track ... and the scene looked brutal.

Victor was hospitalized with multiple injuries Sunday in Del Mar, California after his horse, Bobby Abu Dhabi, went into cardiac arrest while training ahead of multiple scheduled races. The horse's owner, Brian Trump, confirmed the horse had died.

Based on video of the immediate aftermath of the fall -- obtained by TMZ Sports -- it appears Victor was lying motionless for a while before getting help.

As for his status now, he's said to be experiencing shoulder soreness and numbness -- although, he was reportedly conscious and moving. Safe to say, he's out of Sunday's competition.

Bobby Abu Dhabi had a great run, usually with Victor on his back. He recently took third at Belmont, and placed high (including a couple first place wins) in a number of other races as well.

Trippie Redd put on his good Samaritan hat this weekend when a fan passed out at his concert, which he abruptly stopped to help the girl out.

The Ohio rapper was performing in Minneapolis Saturday night when a female in the crowd collapsed. Eyewitnesses tell us Trippie noticed the commotion and quickly cut the music to figure out what had happened ... and soon started demanding someone help her.

It almost sounds like he's chastising concert-goers for standing around -- although, it's unclear from the video who is (or isn't) springing into action on the ground level.

The husband-wife duo who suffered a stunt fail on "America's Got Talent" is quickly learning all publicity can be good publicity ... cause biz is booming despite feeling the burn on national television.

We spoke to Mary and Tyce -- the flying duo whose blindfolded trapeze trick came to a screeching halt when Mary slipped and fell -- and they say they're fielding offers for corporate events and parties from reps who reached out and thought their stunt was really great. Up until ... y'know.

ICYMI ... Mary and Tyce pulled off some incredible stunts on a trapeze before something awful went down -- Mary slipped!! Making things scarier ... there were flames shooting from the trapeze's ends and a fire pit below to really amp things up.

Check it out ... the couple -- who btw is heading off to Europe to perform a Cirque du Soleil show -- tells us exactly what led to the slip-up and what they've got in store for the 'AGT' live rounds.