Ashlee Simpson, 21, turned heads on September 2 at the NYC bar Don Hill’s, as she snuggled and kissed a cute guy in the hot spot’s VIP section. One big problem: He wasn’t Simpson’s guitarist and boyfriend of nearly a year, Braxton Olita; it was Fall Out Boy’s Pete Wentz, 27.

 Indeed, Simpson’s rep tells Us Weekly that Simpson and Braxton “broke up about a week ago. They have decided to take a break.” A source close to Simpson tells Us, “Ashlee has been telling everyone that she’s over Braxton,” and adds that Wentz recently dumped girlfriend Michelle Trachtenberg in order to be with Simpson. For his part, dad Joe may be relieved: A source says when Simpson told him she wanted to move in with Olita earlier this year, “he thought it was totally wrong, immoral and a bad decision. It caused a major rift between her and Joe.” Ashlee had clearly moved on from her past love at Don Hills’ hipster dance party MisShapes that night where, according to Radar online, she proceeded to straddle the Fall Out Boy bassist, (Jessica was dateless). However, when the party got going, the going got vomitous for the rowdier Simpson sister. At one point, Ashlee had to excuse herself to retch, and management kindly blocked off the bathroom for her.