Not a week goes by without hearing about Pete Wentz hooking up with a new girl -- and this week is no different. Who's the lucky girl this time?

Rumer Willis -- aka Bruce Willis and Demi Moore's 18-year-old daughter. Rumer and Pete looked quite the couple at a Hollywood party over the weekend, sources tell British newspaper, The Sun.

Pete and Rumer didn't arrive at the club together, but they soon began chatting and holding hands. "Rumer looked like she was having a great time with Pete," the spy says. "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." And to top it all off, reports the source, "They left the club together later."

Two things to note here:
1. Pete and Lindsay Lohan have hooked up in the past, and Lindsay and Rumer are totally tight. Since when is that OK?
2. Pete, who is 27, is only a year younger than Rumer's stepfather, Ashton Kutcher. We would try to find a girl that both Ashton and Pete have hooked up with (we're sure she's out there), but it would gross us out just a little too much.