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Klum's boyfriend/former bodyguard Martin Kristen kept a watchful eye on the kids as they loaded the cart with the moniker of Halloween.

Mirror Mirror on the car ... but not for long because Ben Affleck just knocked it off.

Ben may have been daydreaming about his "thank you" speech at the Oscars, because the distracted driver/star/director of "Argo" side-swiped a parked Honda that was minding its own business -- decapitating its side mirror.

But Ben did the right thing, leaving a note that even had a friendly salutation: "Hi, knocked off your mirror. VERY Sorry. Will cover everything. Ben."

Mariah Carey got a full police AND umbrella escort on her way out of an "American Idol" photo shoot in Baton Rouge yesterday -- 'cause the only thing more harmful than angry rappers are those damn UV rays.

Carey had told Babwa Wawa that she bulked up her security team after Nicki Minaj allegedly threatened to shoot her with a gun during their blowup earlier this week ... and Thursday she proved she ain't messin' around.

Sources tell us ... Mariah and Nicki both participated in the shoot -- and even posed for pics TOGETHER. We're told the shoot was peaceful, but it's clear the hatchet is not buried.

Tomorrow, the gang has another round of auditions ... and that's when tensions really start to heat up.

Here's the one reason you should still be watching "Glee" ... new cast member Dean Geyer's yoked body.

Flashing his ripped and hairless acting muscles, the 26-year-old skateboarded shirtless through Santa Monica on Wednesday.

Now this is something to sing and dance about.

Brown announced this morning that he kicked his GF Karrueche Tran to the curb because he wants to concentrate on his "friendship" with Rihanna ... and by "friendship" he means he's going to take her to Bone Town.

Brittany Kerr went back into the danger zone Tuesday night ... the center of the Hollywood bar scene ... only this time, the former "American Idol" contestant was spotted with a man who WASN'T wearing a wedding ring.

Chris Brown and Rihanna are barely trying to hide it anymore -- getting up close and personal at a NYC nightclub late Monday night ... then carousing at Rihanna's hotel for hours.

Chris and Rihanna hit up Griffin nightclub in the Meatpacking District -- we're told they arrived 5 minutes apart, and quickly ended up at the same table. Sources inside the club say the two were all over each other, and even disappeared together in a bathroom for 20 minutes.

People inside the club say the duo were kissing and hugging out in the open.

The two left the club separately -- but hours later, Chris was spotted leaving the Gansevoort Hotel, where Rihanna was staying.

By the way, Tuesday afternoon, Chris' clueless GF Karrueche tweeted that Chris sent her roses, a teddy bear and chocolates -- maybe a lame, "I'm sorry."

So we gotta ask ...

Minka Kelly and Chris Evans proved they're more than just friends by swapping spit outside a restaurant in Studio City on Monday.

The sexy couple -- who dated briefly in 2007 -- have been spotted hanging out together in recent weeks, but this is the first time they've gotten hot and heavy in public.

Prior to hooking up with Captain America, 32-year-old Minka broke up with her longtime NY Yankee boyfriend Derek Jeter last year.

She really knows how to play the field.

Halle Berry and Gabriel Aubry have apparently put their custody war on hold ... to honor the sacred tradition of Halloween pumpkin carving.

The two were spotted at a pumpkin patch in Moorpark, CA today -- with Halle walking Nahla around the grounds to hunt for the perfect gourd.

According to multiple photo agencies, both Halle and Gabriel were at the patch AT THE SAME TIME ... however, we have yet to see a shot of the battling exes in the same frame.

Former "American Idol" contestant Brittany Kerr has shut down her Twitter page ... after a gang of angry Jason Aldean fans BLASTED the singer online -- calling her everything from a "skank" to a "homewrecking whore."

The cyber-hate came flooding in after TMZ posted the pics of Aldean -- a huge country singer who happens to be MARRIED -- putting the moves on Kerr at a crowded bar on the Sunset Strip.

Sources connected to Kerr tell us ... she had NO IDEA Aldean was married ... and if she would have known, she would have shut the whole thing down from the start.

Even though Kerr didn't go home with Aldean, people attacked her online ... writing terrible things on her Facebook page including:

"Disgusting homewrecking tramp!"

"what is wrong with you taking advantage of a married man while he was drinking."

For the record, people have ripped Aldean on his Facebook page too. He has since apologized, chalking the whole thing up to a bad drunken decision.

Paul Nassif got to spend Saturday with his three sons ... taking them out for pizza in Bev Hills.

As TMZ first reported, a judge granted Nassif the visit Wednesday after he showed up in court armed with a report from the Department of Children and Family Services saying there was no proof he abused the kids -- despite allegations from his estranged wife, Adrienne Maloof.

The judge ordered a court-appointed monitor be present during the visit ... and we're guessing he's the conspicuous guy with the bag.

Martin Kristen took off his bodyguard cap yesterday and donned his boyfriend one ... cheering alongside GF Heidi Klum at her son's football game in Brentwood yesterday.

Paris Hilton gave a subtle apology to the gay community yesterday in Hawaii by sporting a bag adorned with a rainbow flag on it while waiting for her flight back to Los Angeles.

Paris issued a mea culpa last week after a recording was released in which Paris could be heard saying gay men are "disgusting" and that "most of them probably have AIDS."

Mario Lopez's 2-week wife Ali Landry is an expert on her knees, easily keeping her balance during a smoking hot paddle boarding session in Hawaii earlier today.

In case you forgot, Mario and Ali were married on April 24th, 2004. Their marriage was annulled two weeks later.

With Arnold Schwarzenegger's tell-all autobiography about to come out, it seems only fitting that his all growed-up love child Joseph Baena and his baby mama/former maid Mildred Baena would be spotted out in Bakersfield, CA on Thursday.

As we reported earlier, Arnold says his affair with Mildred was the "stupidest thing" he did during his marriage to Maria Shriver and revealed he has not shown her the book yet either.

Fun fact: Schwarzenegger's book comes out on Monday ... the day before Joseph's 15th birthday.

She got caught cheating on Robert Pattinson, but philandering girlfriend Kristen Stewart may have been trying to send some sorta mixed message by hitting up a restaurant in Paris on Thursday named La Fidelite ... which in English -- believe it or not -- means "fidelity."

Kristen can't take back what she did, but she can try and eat her words.