A run-in with husband Pete Wentz’s ex put Ashlee Simpson in a foul mood at a party the other night. After being seated near actress Michelle Trachtenberg, Simpson reportedly proceeded to get drunk and behave inappropriately, hurling insults and giving her husband a lap dance while staring directly at Trachtenberg, according to Page Six.

“She was grinding up on Pete like a stripper. It was actually pretty disgusting,” a source said. Simpson’s rep would only say: “It was just a misunderstanding. Ashlee has since apologized to Michelle and they remain on good terms.”