Nick and Kristin?

According to National Ledger, "It has been reported that Nick Lachey's alleged Elizabeth Ann Arnold relationship has cooled - a report says that things are heating up very nicely with Laguna Beach" chick Kristin Cavalleri. The item claims "Newlyweds" hubby Nick Lachey is hooking up with "Laguna Beach" babe Kristin Cavalleri. The swingin' single ex of Jessica Simpson introduced his mother to bubbly blonde Cavalleri last week over dinner at Palomino in Westwood, Calif., tattles an eatery insider.

Lachey had previously enjoyed some rebound relief with buxom Miss Kentucky Elizabeth Ann Arnold, while Cavalleri had been dating former Olympian Bruce Jenner's son, Brody. But Cavalleri is playing it cool: When she arrived at Koi in L.A. the other night and saw Lachey and a group of buddies having dinner, she beat a hasty exit to meet some girlfriends for drinks at the Four Seasons hotel."

Source: National Ledger