Nurse!

Zac Efron mysteriously ended up in a bad area of downtown L.A. just after midnight Sunday ... and ended up getting violently socked in the mouth by a sketchy transient ... law enforcement sources tell TMZ.

We're told cops were on patrol under the Harbor Freeway when they saw Zac and a man he identified as his bodyguard. Cops saw Zac and the other guy in a full-blown melee with at least 3 other people.

After breaking up the fight, cops questioned Zac. He told them they had run out of gas and were sitting in the car. Zac said while waiting for a tow truck they threw a bottle out the window -- he never said what was in the bottle -- and it smashed on the pavement near a group of transients.

Zac said the transients confronted him and the bodyguard because they believed the pair hurled the bottle at them. Zac says 2 of the transients attacked the bodyguard and when Zac got out of the car to help, he got cold cocked in the mouth. Zac said, "It was the hardest I've ever been hit in my life."

You'll recall ... Zac mysteriously broke his jaw in November, saying he slipped on a pool of water in his home. Zac was in rehab twice last year for cocaine abuse.

The area where this occurred is rough. Cops are on high alert for drug deals and gangs. One source says Zac was "obviously intoxicated."

Law enforcement tells TMZ ... no one was arrested because they viewed it as "mutual combat."

We contacted Zac's rep ... so far no comment.

"Basketball Wives" star Tami Roman is on the rebound after Wednesday's diabetic emergency that put her in the hospital -- she tells TMZ, she has just been released ... and is currently resting at home.

Tami says she was rushed to the hospital after going into diabetic shock and fainting in her Houston house. Her daughter found her passed out and called 911.

Tami says she was also suffering from dehydration.

Lisa Ling is getting a new view -- the defendant's table in a courtroom -- because she's being sued by a woman who claims she slipped and fell on Lisa's fabulous Santa Monica property.

Lisa was throwing an architectural and design event in June to showcase her new digs, when a woman named Yolanda Para-Keresztes claims she slipped on the outdoor steps that had some errant gravel and tumbled to the ground, fracturing her foot.

Frankly the case isn't that interesting, but we thought you'd like to see Lisa's house. It's been featured on HGTV and is one of the first eco-friendly homes built in the old Santa Monica area.

It's the first energy-neutral home -- which means it produces as much energy as it consumes -- in Santa Monica.

Mantecore -- the white tiger that mauled Roy Horn ... has died after an illness.

The 380-pound tiger severely injured Horn on a Las Vegas stage back in 2003, leaving him partially paralyzed. Siegfried & Roy claimed then and continues to maintain it was NOT an attack. Instead, they say, Roy was having a mini-stroke and Mantecore saved his life by dragging him offstage.

Roy says of the tiger, "We spent many hours together and he never failed to bring me great joy and wonderment. It was my great honor to be beside him at the end. He is now playing with his siblings in white tiger heaven."

The man who claims he was attacked by Shaquille O'Neal says the injuries to his neck and spine were so bad, he needed major surgery to repair the damage ... and says X-rays show just how bad it was.

TMZ Sports has obtained one of the X-rays, which Rob Williams' lawyer says was taken after a November surgery to correct a herniated disk, suffered in the alleged Shaq attack at Turner studios in May '13.

Rob's attorney, William J. McKenny tells us his client required 4 screws and a metal plate as a result of the alleged "punch-tackle" ... and says he's still in serious pain.

While Shaq insists the two were simply horsing around, Rob's attorney tells us his client was simply standing outside the break room, looking at his cell phone when Shaq came out of nowhere.

"Scandal" star Columbus Short LEVELED his victim during that bloody bar fight -- leaving the man in a heap on the floor -- and then continued to rail on him ... and the pic tells a pretty gruesome story.

Sources at Gabe's Bar and Grill in L.A. tell us ... Short leaped over the father of the bride-to-be -- it was an engagement party -- and punched his 37-year-old victim in the face, knocking the man to the ground.

We're told Short continued his beating until the victim "looked dead." Short then left the bar.

As you can see in the pic, the victim was placed on a stretcher with a neck brace before being transported to a nearby hospital.

There are some things a hug cannot fix ... like a broken leg.

That's the lesson learned by "Entourage" star Kevin Connolly, who broke his leg on the set of the movie last week while trying to catch a pass from Seattle Seahawks QB Russell Wilson.

According to our sources, Connolly tripped on a sprinkler while trying to make the play, which resulted in Jerry Ferrara falling on his leg.

We're told it was a pretty clean break -- think of how bad it would have been pre-weight loss Turtle -- and that filming was not interrupted at all by the injury.

Way to take one for the team, E.

"Homeland" star James Rebhorn died at his home in New Jersey Friday night ... after a long battle with skin cancer ... TMZ has learned.

Rebhorn's wife Rebecca tells us the actor was diagnosed with melanoma in 1992 ... and he's been getting treatments ever since.

We're told his condition drastically worsened recently and he began receiving hospice care at his New Jersey home.

Rebhorn has been acting for 5 decades ... he was awesome as Claire Danes' perpetually worried Dad in "Homeland."

He also appeared in "Meet the Parents," "Scent of a Woman," and "Independence Day." He was also the lawyer who put Jerry, George, Kramer and Elaine behind bars in the "Seinfeld" series finale.

His wife Rebecca says James insisted on working despite his condition ... right through his theater performance in January.

He was 65.

Skrillex knows all about hitting his head on stage ... which is why he empathizes with Tiesto who's recovering from a concussion Friday ... when the DJ bonked his noggin on a giant LED.

Skrilly was cruising out of LAX Saturday when he told our photog he pulled a Tiesto back in the day during a gig in Mexico ... but luckily, he didn't have to bail 'cause it was at the end.

Check out the video ... it looks SUPER PAINFUL!

Tiesto -- one of the most popular DJ's on the planet -- was rushed to a hospital Friday night in San Jose ... after he hit his head on the giant TV screen above his turntables.

Tiesto was supposed to play a show last night in San Jose ... but whacked his head on the LED as he made his way to the stage -- and went down HARD!

According to reports, the DJ tried to play his set anyway -- but management said no.

Tiesto updated his fans a few hours later saying he got a a couple stitches and doctors said he suffered a concussion.

For now, he's gotta stay off his feet for a few days ... meaning his set at a concert in L.A. tonight is cancelled.

Sorry EDM kids.

Snoop Dogg is mourning today the impending death of his beloved Uncle June Bug ... who at the time of this post is taking his last breaths.

Sources tell us ... Snoop is at the hospital with June Bug and Daz Dillinger ... and they are trying to comfort him as he succumbs to colon cancer.

We're told doctors have informed the family ... barring a miracle, the 70-year-old June Bug will die before day's end.

June Bug was known to accompany Snoop on tour and was often seen dancing on stage during concerts. June Bug was also the uncle of rapper Daz Dillinger.

rip uncle junebug . greatest to ever do it !!! heaven wouldn’t be the same without u !

— Snoop Dogg (@SnoopDogg) March 21, 2014

It's the question millions of couples ask themselves before entering the delivery room -- and now Jay Cutler's in the same boat -- does your wife want you to see EVERYTHING when she's giving birth?

Fortunately for the Chicago Bears QB -- he won't have to guess ... 'cause his wife Kristin Cavallari was out in NYC today and told us.

Steve-O's latest stunt -- backflipping from a bridge into the shallow, San Antonio River -- could land him in jail for the crime of "Deadly Conduct."

Steve made the jump last Friday ... a very risky proposition given the water below is only 4' deep.

Cops threatened to cite him but didn't ... however, law enforcement sources now tell us the "Jackass" star is under criminal investigation.

So, you ask, what is the crime of "Deadly Conduct." Under Texas law, someone who engages in reckless conduct that could place someone else in danger of great bodily injury, then it's considered deadly conduct ... a misdemeanor punishable by up to a year in jail.

A cast member from Thunder From Down Under -- the Las Vegas male strip group -- was hit in the face by a ricocheted bullet after the group confronted an intruder in their dressing room.

According to KVVU in Las Vegas, the cast discovered a man rifling through their belongings in their locker room at the Excalibur Hotel and Casino. The cast confronted the man and pushed him out of the locker room and into a courtyard.

It was then, the station says, the man pulled out a gun and fired a shot in the air. The shot ricocheted off of a wall ... and hit one of the cast members in the face.

Police say the victim's injury was minor and the shooter was taken into custody by police.

No abs were harmed during the ordeal.

Richie Incognito is back -- 3 weeks after being admitted to a psychiatric care unit -- and he's already TWEETING AGAIN.

Richie resurfaced on Twitter late Tuesday night ... writing, "I missed you guys. Thanks goes out to my family and friends for the tremendous amount of support."

He added, "I look forward to getting back to work ASAP."

Incognito also said, "It's great to be HOME in Arizona."

We broke the story Richie was placed on an involuntary psychiatric hold in AZ back in February after smashing his Ferrari with a baseball bat in front of his Scottsdale home.

TMZ has obtained the 911 call made by the driver of the Miley Cyrus tour bus that caught on fire last night ... and he was clearly out of breath and panicked as he called for help.

In the 911 call, the driver tells dispatch that everyone got off the bus safely, but that the bus was still on fire.