Nurse!

After his concert in London, Justin posted the above pic of his foot in a cast on his Twitter -- along with a play-by-play on how he hurt himself, saying, "In the last song ONE TIME i tripped over something on stage coming down the ramp and felt my ankle roll in a very bad way.

turns out I fractured my foot and had to finish the song on a broken foot. After i was done i was in such pain i skipped the encore and got off stage and back to see the medics."

It's clear from the video he's hurtin' -- fortunately his loyal army of 12-year-olds are willing to nurse him back to health.

Cops tell TMZ a young girl was hospitalized this afternoon after fans went crazy ... anticipating the arrival of 15-year-old music star Justin Bieber at a Long Island mall.

Cops said the girl was taken out of the Roosevelt Field mall on a stretcher just moments ago.

Bieber never showed, because over 1,000 screaming girls showed up and mall security lost control of the crowd. The senior vice president for sales at Def Jam Records, 44-year-old James Roppo (mug shot, below right), ended up getting arrested.

Bieber posted the following message on his Twitter account, pleading with his fans to leave the mall:

"The event at roosevelt mall is cancelled. please go home. the police have already arrested one person from my camp. I dont want anyone hurt."

The injured girl should be okay.

UPDATE: Employees at Abercrombie Kids tell TMZ someone in the mall falsely screamed out that Justin was inside their store, so a ton of kids rushed the place. The workers said a fight broke out in front of the store -- and that it wasn't the only fight that occurred.

Nicole Richie was telling the truth, the whole truth and nothing but the truth Monday in court when she said she wasn't feeling well -- because now she's holed up in a hospital, sick as a dog.

Richie ended up having pneumonia ... and is now being treated at Cedars-Sinai Medical Center in L.A., this according to her rep.

Devastating news for the 8 L.A. Galaxy fans out there who expect Beckham -- and his powerful right foot -- to lead the soccer squad to a championship Sunday afternoon.

So far, it's unclear what's wrong with the foot ... or ankle ... but one thing's for sure -- maybe he shouldn't be carrying the kids around on it?

Brock Lesnar is so sick, he'll be going to the Mayo Clinic so doctors can figure out what to do -- but it will probably require major surgery ... UFC Prez Dana White tells TMZ.

White tells us Lesnar -- the UFC heavyweight champ -- is "very, very sick" with some sort of intestinal disorder, although listening to White, it sounds a lot more serious than that. White says the condition will require "major surgery."

White is going to visit Lesnar in the hospital and is trying to get him transferred to the Mayo Clinic, one of the most renowned medical facilities in the world.

White says Lesnar -- formerly of the WWE -- was diagnosed with mono more than a week ago and was "bummed out" that he had to cancel the fight and went to Canada to rest. White says Lesnar collapsed in Canada a week ago today and has been hospitalized ever since.

White acknowledges the current condition is not mono but he will not be specific. White says the condition is not HIV or cancer.

And, White tells TMZ, "There's a possibility Lesnar will never fight again."

Last night in Jersey, the chesty "Dr. 90210" star told us how he sprung into action when passengers suspected an 11-year-old Scandanavian girl was coming down with the swine flu during the flight.

Though he didn't have a quarantine bubble available, Rey claims he did the best he could -- treating the sick little girl with a quick fix of sugar, water and instructed her to get further medical assistance after landing.

It's the second time Rey has "saved the day" during a flight -- back in May '06, the karate expert helped take down an 80-year-old man who rushed the cabin.

Brock Lesnar -- the UFC Heavyweight Champ -- is in "bad shape" according to UFC president Dana White and won't be fighting anytime soon.

White made the announcement after UFC 105 last night, saying "He's in a hospital up in North Dakota somewhere right now. He went to Canada and some bad stuff happened to him, so we've got to figure it out ... He doesn't want to talk about it publicly, but he's in bad shape. He's not well and he's not going to be getting well anytime soon."

Lesnar originally pulled out of a November 18 fight and reports suggested he had swine flu. The fight was rescheduled for January 2, but then it was announced Lesnar had mononucleosis.

But White made it clear, Lesnar's problems go beyond mono: "He is not good. He is very, very sick and he's going to be out for a while."

We got the infection-free legend yesterday at LAX -- who said he was down with the sickness just 10 days ago.

Though symptoms include fever, diarrhea and vomiting,

says it "wasn't too bad."

The UFC kingpin tells TMZ he was changing lanes while cruising through Las Vegas Wednesday afternoon when a "Hyundai rent-a-car" suddenly stopped in front of him -- and Dana smashed into the back of it.

White said his beloved car -- which he had only driven 3 times before the crash -- took the brunt of the blast ... while the Hyundai only suffered a few minor scratches.

As for Dana's condition, he tells us, "I'm fine ... but my heart is broken."

The 73-year-old "Easy Rider" star added that it's "no big deal" and said he "feels great."

Fight on.

Never have we been so grateful to see someone show off one of their "Dancing with the Stars" injuries.

Sure beats The Woz and that fractured foot bone.

In the footage, Pitt can be seen trying to maneuver his bike between a van and a parked car at a red light when he suddenly loses control -- and crashes to the ground.

During his fall, Brad slams against the car and it appears his bike knocks into the van.

Brad said he was "fine" after the minor crash -- but the chopper needed to be towed away.

We're told Brad tried to maneuver his bike between a parked car and a car stopped at a red light, and his handlebars clipped the parked car.

We're told he lost control and fell over -- and everything is fine.

TMZ has learned Brad Pitt was involved in a minor motorcycle accident moments ago in Los Angeles.

A witness at the scene tells us Pitt was trying to weave in between cars while at a red light --- but he lost control and fell off the bike.

We're told he got up and moved the motorcycle to the side of the road then ran into an apartment building.

Our witness says he waited for someone to come pick him up and now he's no longer at the scene. Pitt left his motorcycle behind.

Morrissey -- the former lead singer of The Smiths -- was rushed to the hospital last night after collapsing on stage during a concert.

The 50-year-old was performing at the Oasis Leisure Center in Swindon, UK when he complained of breathing difficulties.

The singer was rushed to the Great Western Hospital where he remains in stable condition -- a rep for the hospital said his condition is not thought to be life-threatening.

Palatas -- who had been working with the saw at his house in Northridge, CA back in September -- made the frantic call himself ... telling the dispatcher he "cut it all the way down to the bone ... I must have cut a half-inch off my finger ... I'm bleeding quite badly."

When the dispatcher asks Palatas if he's breathing normally, the actor replies: "I'm trying to keep it as normal as possible, sir, it hurts like f**k!!" Palatas was eventually taken to the hospital and sewn up.

We give this call two mangled thumbs up.

As TMZ previously reported, Gable had a blade plunged into his rib cage during a fight at a house party in Calabasas this past August.