Fall Out Boy star Pete Wentz seems fixed on a romance with Ashlee Simpson, despite his claims the pop couple would only be an item in "a different universe."

Wentz and Simpson continue to deny romance rumors, but might have some explaining to do after they were photographed smooching in the VIP section of a Las Vegas club on Monday night.

TMZ reports that several large security guards attempted and failed to stop people taking snapshots of the couple, as they partied at Jet nightclub. And one source claims the two stars couldn't keep their hands off each other.