Ashlee Simpson & Pete Wentz: The Hot Vacation!

When Pete Wentz sat for a cover interview with Rolling Stone in February, he was fairly clear that he's not dating that loser Ashlee Simpson.

"Maybe in a different universe, we'd be some hot couple, but not in this one," the rocker said.

Oh snap! Well, apparently he feels differently about Ashlee Simpson now.

The plastic surgery fiend and the Fall Out Boy frontman - with whom she's been linked before - enjoyed a recent hush-hush getaway to Mexico.

A Simpson source tells Us Weekly, "She really likes him."

Thanks for the awesome quote, source. The feeling seemed mutual on March 12 when the pair hit the West Hollywood hot spot known as Hyde.

"He massaged her back and played with her hair," says an eyewitness.

Crazy Joe Simpson is rolling in his grave right now! As is Ryan Phillippe - and you thought you were the only man in her life, Ryno! Dumbass.

Still, Wentz is trying to play it cool. As anyone who's tried to score some tail with a nasty chick knows, it's all good until your friends find out.

A source close to the rocker says, "they aren't serious."

Busted. Wentz and Ashlee Simpson aren't the only ones hooking up this spring. But they're probably the most annoying - with the possible exception of Ashlee's own sister, Jessica Simpson and John Mayer.