ASHLEE Simpson is married to Pete Wentz and she’s the mother of his child, but she’s apparently still insecure when it comes to her man’s former flames.

An out-of-control Simpson loudly trash-mouthed “Gossip Girl” actress Michelle Trachtenberg on Monday night at the “DJ Hero” video game party at LA’s Wiltern Theatre, according to PerezHilton.com.

Ashlee, Jessica Simpson’s younger sister, had to be restrained at the event where Jay-Z and Eminem performed. The trouble started when Wentz and Simpson were seated near Trachtenberg, who dated Wentz before Simpson met the Fall Out Boy bassist.

According to PerezHilton: “The evening started off very civilly. Pete and Ashlee had a pleasant conversation with Michelle and her boyfriend for close to 20 minutes, and even showed [Trachtenberg] some baby pictures of [Ashlee’s] little boy, Bronx.”

But then Simpson started drinking. “Things got out of control,” an insider was quoted. An increasingly loud Simpson began to give Wentz a lap dance while staring directly at Michelle and hurling insults at her. “She was grinding up on Pete like a stripper. It was actually pretty disgusting,” a witness told the Web site.

Things reached a climax when Simpson screamed at a confused Trachtenberg, “I hope you know, the whole time you were dating Pete, I was [bleep]ing him!”

A bystander dragged Simpson away from Trachtenberg, who once starred in “Buffy the Vampire Slayer,” while Wentz looked mortified.

Trachtenberg’s spokesperson didn’t return Page Six’s calls. But Simpson’s rep said, “It was just a misunderstanding. Ashlee has since apologized to Michelle and they remain on good terms.”

Meanwhile, Wentz and Simpson will celebrate his 30th birthday this weekend at club Bank at the Bellagio.

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Behati Prinsloo

Michelle Trachtenberg

Behati Prinsloo and date depart The Whitney Contemporaries’ Art Party and Auction at Skylight Studios on Hudson Street last night in New York City. Behati was just named the new Victoria’s Secret spokes-model for the “Pink” line. The Whitney Contemporaries is a dynamic group of art patrons between the ages of twenty-one and forty, committed to supporting the Whitney’s mission of championing emerging voices and artistic innovation. Also showing up at the gala looking not-so great, was actress Michelle Trachtenberg. Who gave her the idea that a green purse matched her dress? And gold high heels? This girl needs fashion lessons. Silvia Miles looks better !

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MICHELLE Trachtenberg , the new villainess on “Gossip Girl,” full-on fainted Tuesday night in the middle of the party she was hosting at the new Sunglass Hut store in SoHo. Like some Victorian heroine with the vapors, the lush-lipped actress, in a glamorous Diane von Furstenberg dress, swooned at 8 p.m., but gamely partied on until the bash ended an hour later. In fact, she was seen later, much later, at 1Oak.

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Michelle is such a sweet and sexy girl.

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Michelle having a good time.

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Michelle and Blake having a good time at the after party.

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Michelle Trachtenberg looks so good.

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Michelle Trachtenberg PhotoShoot.