Last weekend, Pete and Rumer got tongues wagging with their amorous display at Shag in Hollywood. A fellow clubgoer told the Sun, "Rumer looked like she was having a great time with Pete. He's a good looking boy and they sat together in the VIP area while their pals danced. Pete kept winding his arm lovingly around Rumer's neck and she was holding his hand…They left the club together later."

The on Tuesday, Rumer and Pete showed up at another L.A. club, Teddy's. Unfortunately for Rumer, Pete - who, at 27, is nine years older than her - was mostly interested in his ex-girlfriend, Michelle Trachtenberg. He spent most of the night trying to reconcile with Michelle. A witness told Perez Hilton, "Pete confronted Michelle and they got into a heated conversation. Rumer kept trying to talk to Pete, but he was ignoring her. Pete kept trying to touch Michelle's face," says an observer. "He soooo wanted to kiss her! Poor Rumer looked heartbroken." Another snitch for Perez said that Pete even called Michelle his girlfriend at one point after a group of girls asked him to dance with them. The source said, "Pete turns around, grabs Michelle and says to the girls, 'My girlfriend gets really jealous when I dance with other girls, right baby?'" The reunited lovers took off together later, leaving Rumer behind.

Finally, as recently as two weeks ago, Wentz was still being linked to Ashlee Simpson. The pair have been spotted kissing on several occasions and were seen holding hands at a Grammy Awards pre-party earlier this month. But Pete dissed Ashlee in a Rolling Stone, reports Page Six. When asked about Simpson, Wentz said, "Maybe in a different universe, we'd be some hot couple, but not in this one." Ouch.