Nurse!

One of Catherine's reps now tells People.com, "After dealing with the stress of the past year, Catherine made the decision to check in to a mental health facility for a brief stay to treat her Bipolar II disorder."

We're told Catherine had been in Silver Hill Hospital in Connecticut for treatment, but she has checked out.

Gaga appeared to be unfazed by the fall -- getting right back up and singing her face off like nothing happened.

Sources close to Sam -- who posted the bruised up picture on her Twitter earlier today -- tell TMZ, she had just finished performing at a bar called The Brig in Venice early Saturday morning ... when a car came out of nowhere. Sam hit the pavement when she tried to swerve out of the way.

According to sources, Sam took a nasty spill and had to go to the hospital to get stitches.

We're told she's doing fine -- but canceled a show in Utah the day after the accident just to be safe.

A rep for Hall tells TMZ he is currently in the hospital being treated for cardiac issues. The rep says Hall will be in the hospital for at least three more days while doctors check him out.

The rep says doctors are looking into the various meds Hall is taking -- 10 in all, for various ailments.

Hall's appearance at a Top Rope Promotions event last night was sketchy to say the least -- he looked clearly out of it the entire time and it took him 10 minutes, with the help of a few police officer, just to leave the ring.

Christensen -- who also starred in "Traffic" back in the day -- was leaving King's Road Cafe in L.A. yesterday when she showed off an ultrasound device connected to her cast.

The actress explained, "It stimulates bone growth ... technology today, right!?"

We broke the story -- three guys filed a lawsuit against Vida after they got their asses kicked last March outside of Vanguard nightclub ... while she was inside celebrating her birthday.

In the video -- you can see the three guys (in white) taking a pounding from the boys in black.

The guys' lawyer, Fred Hanassab, tells TMZ Vida was included in the lawsuit because her bodyguard was allegedly one of the attackers. Fred claims the fight started when a security guard made an obscene comment to one of his client's girlfriends.

According to the Los Angeles County Sheriff's Department, Zito was driving on Sunset Boulevard when he got into a 2-car accident. Zito was checked out at Cedars-Sinai Hospital and released.

Authorities say it appears Zito was not at fault in the wreck.

Zito and the World Series champs are in L.A. for their opening series with the rival Los Angeles Dodgers -- and the accident won't affect tonight's game since Zito is 4th in the Giants' rotation.

Tonight's starter -- Tim Lincecum -- had an accident-free evening.

According to the lawsuit, the brawl went down back in March, 2010 at Vanguard Club. The plaintiffs claim they were subject to a "violent attack" at the hands of the defendant's employees ... and suffered "severe physical injuries."

The suit names Vida and the club as defendants ... it doesn't say if Vida's famous booty had anything to do with the alleged brawl ... but chances are it was nearby.

Judge told Harvey, "I was feeling funky this morning ... funky enough that I knew someone should give a gander over what I got."

As TMZ reported, Judge was taken by ambulance to the hospital after complaining of intestinal discomfort.

Judge said, "I'm really fine. I wanted to go back to work this afternoon," adding, "I'm exhausted. I'm just tired. A lot of things just zoned together, including the bad news of the world."

Her Honor also said, "At my age, I know my body. My body is fine."

Judy says she's at Cedars-Sinai Medical Center in L.A.., where she just had an MRI. Doctors are doing a few more tests and she says she'll be out tomorrow.

Judy says, "I'm gonna go home tomorrow. It was a bad idea to fly home tonight."

Judy has one big regret about going to the hospital today. She says some people from Las Vegas were coming to see her this afternoon to talk about a new Judge Judy slot machine. She says the meeting will be put on hold for a week.

Harvey to Judy: Get back on the bench, stat!

TMZ has learned Judy was at her studio in L.A. when she began feeling nauseous and experiencing "intestinal discomfort."

Paramedics were called and Judy was taken to a nearby hospital.

Usually Lindsay Lohan is the one begging for attention -- but a homeless man in Huntington Beach, CA turned the tables on the troubled star yesterday ... all in an effort to make a well-deserved buck.

The man -- who's low on cash-flow but has a rich sense of humor -- was spotted yesterday near the 405 Freeway in Huntington Beach, CA ... holding up a sign that said, "Slept with Lindsay Lohan Need Help."

Zsa Zsa's husband Prince Frederic von Anhalt tells TMZ he sounded the alarm moments ago because Zsa Zsa could "hardly breathe" at their Beverly Hills mansion.

Anhalt tells TMZ he's "really worried we may lose her this time."

UPDATE: Crisis averted ... Prince tells us Zsa Zsa was diagnosed with pneumonia and a urinary tract infection. Docs put her on antibiotics and she'll be heading home.

One day after the rumble-on-tape, Britany Truett took photos of the damage to her eyes, neck and chin ... photos that could be evidence now that both women have been arrested over the fight.

We're told "A.I." staffers helped Casey up and put him in a chair so he could calm down.

Ironically, his song choice Thursday was "I Don't Need No Doctor."

Our "Idol" spies tell us ... Casey felt horrible that the judges used their save for him, saying "I feel really bad that other [contestants] might have to go home now because they [the judges] used the save on me."

A family member tells us ... doctors made the decision to remove Rob's appendix after his mom Kris took him to an L.A. hospital.

We're told Rob had been in pain all day long ... and his sister Kim had been taking care of him at his home ... until the pain became unbearable.

He was treated at a local hospital and released.

A rep for the singer said the bullet just grazed his hand and he's doing well, saying, "He’s fine now. It happened late yesterday night and he was released after a couple hours.”

The shooting comes on the eve of the presidential elections. Wyclef was a candidate but ruled ineligible because of residency requirements.