Jerry Lewis has mad Yiddish flow ... or maybe it's mad gibberish flow ... either way, it was definitely an attempt at a freestyle rap ... and TMZ has the footage.

The 87-year-old legend unleashed his skillz last week in between shooting scenes for his movie "Max Rose" -- when he injected himself into a rap battle with "America's Got Talent" sensation Chris La Vrar (who just happened to be on the set that day).

Lewis -- impressed with La Vrar's rhymes -- replied, "Very good. Very, VERY good ... I want to do one now in Jewish."

The crowd laughs -- but Jerry was SERIOUS -- and busts out a rap that you've just GOT to hear ... especially if you're a Yiddish scholar ... because then you can tell us what he says.

Seriously, we tried to make out the words ... but no dice.

So ... help?

"America's Got Talent" star Zac Gordon ... aka Horse ... aka the guy with iron testicles ... is lucky to be alive ... after smashing his car into a tree while trying to avoid striking a deer, TMZ has learned.

Horse -- who became famous for allowing people to bash him in the scrotal-region on AGT -- tells us he was driving in Harrisburg, PA Saturday when a deer suddenly ran out in front of his car.  Horse says he jerked the wheel, trying not to kill the animal ... but lost control and went careening into a tree.

Zac says he hit the tree so hard the car flipped over -- "I legitimately thought I was going to die."

An ambulance rushed to the scene and hauled the AGT star off to the hospital. He was released later that night with a possible concussion, sore neck and scratches ... but luckily no major injuries.

"I'm just glad to be alive," Horse tell us.

Now, here's Zac crashing into other things:

Mel B isn't winning any hearts and minds in the "America's Got Talent" audience ... sources tell TMZ, she just got booed AGAIN ... this time over an arguably racist joke.

Sources at the NYC auditions tell TMZ, a comedian took the stage moments ago and began to tell a joke about how black taxi drivers are more entertaining than other taxi drivers ... and Mel buzzed him.

She said, "I found it really offensive. There was no need to do a stereotypical black joke. It was not funny." But the audience disagreed ... booing Mel for hitting the red button. 

Fellow judge Howie Mandel then asked the audience if they thought the joke was offensive ... and the audience replied with a loud NO.

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Howard Stern said Mel lacked a sense of humor and Heidi Klum chimed in, saying, "There will always be jokes made about being black and white ... I agree with you that we should laugh about it."

So we gotta ask ...

Mel was in New Orleans Monday, along with Howie Mandel, Howard Stern and Heidi Klum.  The first act of the day was Lagniappe, a very popular New Orleans brass band. 

Mel told the band ... she's not a fan of brass music.  Bad move in The Big Easy.  The audience went nuts on her, screaming "Go home," and "No respect."

Mel became unglued, and leaned over to Howie, who comforted her.

Heidi did fine. We're guessing being really, really hot helped.

Heidi Klum is ready to hit the big red button on "America's Got Talent" -- telling TMZ, she's super excited to judge on the upcoming season ... and Howie Mandel is already taking every opportunity he can to make inappropriate jokes at her expense.

Howie called in to TMZ Live today to talk about Heidi ... and before we knew it, she jumped on the phone to tell us how excited she was to be on the show, saying, "I'm about to hit the 'X'!"

We won't give away Howie's retort ... but you can probably guess where it's going (hint: it involves Seal) ... and it's hilarious. You gotta watch the clip.

TMZ broke the story ... Heidi will be one of the new judges on "AGT" alongside Howie, Howard Stern, and Mel B.

Sharon Osbourne took a vicious parting shot at NBC -- the day after the network rolled out its new "America's Got Talent" judges -- and made it clear ... you'll NEVER see her face on the Peacock again.

Sharon was leaving Madeo when she shot down rumors she quit 'AGT' over a feud with fellow judge Howard Stern -- and lay blame squarely on NBC for dissing her son.

As we previously reported, NBC cut Jack Osbourne from a reality show last year -- and Sharon believes they did it because he was diagnosed with Multiple Sclerosis.

So, we asked Sharon if she's willing to let bygones be bygones, and she said ... "Over my dead body!"

But that was just the start ... once you see Sharon's full response -- which involves her ass -- it's obvious she won't be popping up on "Celebrity Apprentice," "Whitney," "Days of Our Lives" (yeah, that's still on), etc ...

"America's Got Talent" just got a lot hotter ... because TMZ has learned Heidi Klum has just signed on to be a fourth judge on the reality TV show ... which begins taping tomorrow.

Sources close to NBC tell TMZ that "AGT" scored the smokin' hot model in a last minute negotiation and Heidi hopped on a plane to New Orleans today ... where the show is holding its first audition rounds.

TMZ obtained a photo of the "AGT" set taken today ... which clearly displays the name "HEIDI" underneath her own personal judge's "X" ... which she'll use to crush people's dreams.  

Heidi joins other "AGT" judges Howie Mandel, Howard Stern and new-comer Mel B. You'll recall Sharon Osbourne quit the show at the end of last season.

"America's Got Talent" is working to fill the vacant spot at the judge's table left by the departure of Sharon Osbourne ... and TMZ knows the identities of the 3 women the show has targeted.

According to our sources, producers have their eyes on Shannen Doherty, Carly Simon and Leann Rimes. We're told the show is looking for a strong and opinionated woman -- and they're thinkin' any one of them would fit the bill.

The judge's spot became available over the summer after Sharon Osbourne decided to quit the show after she claimed NBC dropped her son Jack from a reality show due to his MS diagnosis.

It's possible the producers could have other seats to fill -- we're told Howard Stern and Howie Mandel are not under contract for next season ... so it's conceivable the show could have an all-new judge's table.

As for Doherty, Simon and Rimes, we're told no offers have been made ... yet.

NBC spokesperson Sharon Pannozzo claims no such list of prospective judges exists -- but our sources, and they're good, say it does.

The nut-smashing "America's Got Talent" star who became famous for abusing his testicles on TV was seriously injured in a stunt-gone-wrong ... suffering several broken bones and a soiled pair of underpants, TMZ has learned.

The man at the center of the painful situation appeared on the show as "The Horse" -- real name Zac Gordon.

Gordon tells us he was filming a stunt last weekend with some of his "AGT" buddies in which he was supposed to jump from a two-story roof and land crotch-first on a wooden plank.

In the video ... you see Horse hit the plank -- but he says he ultimately landed on a bucket of cement that was being used to hold the wood in place.

Horse tells us the impact was so intense ... he broke several ribs and defecated in his shorts upon impact. 

The amateur daredevil says he refused to go to the hospital ... but consulted with a doctor afterward just to be safe. 

"America's Got Talent" finalists The Untouchables -- that sweet group of adorable kids -- were almost thrown out of their NYC hotel this week after raising hell and creating chaos ... TMZ has learned.

Multiple sources tell us ... the hotel was flooded with complaints from guests who claim the dance squad -- composed of kids ranging between the ages of 8 and 13 -- were causing all sorts of noise and even throwing objects out of their windows.

We're told the hotel threatened to boot the kids from the premises ... but "AGT" producers swooped in at the last minute and begged management to let them stay. The hotel agreed, but made it clear -- if they heard one more complaint from other guests, the group would be forced to hit the road.

A rep for the hotel tells TMZ ... "We gave them a verbal warning to let them know if the problem persisted they would be kicked out of the hotel."

So far, we're told the kids got the message loud and clear ... and the gang is still staying at the hotel.

Orthodox Jewish teen Edon Pinchot just hit the mother lode ... even though he's been booted from "America's Got Talent," he's getting a bunch of free stuff!

If you didn't catch it ... 14-year-old Edon -- who wore Yarmulkes for his singing performances -- was brutally eliminated in the semi-final round.

But it's not all bad news ... The owner of Cool Kippahs -- a NJ Yarmulke store -- tells us he's a huge fan of the "Jewish Justin Bieber" ... and it doesn't hurt that Edon was already a customer.  The store owner is impressed that Edon proudly sports the Jewish head piece, so he's sending the kid 3 or 4 of them ... gratis!



Now all Edon has to worry about is the significant mother issues.