Paris moves on to Roddick

American socialite Paris Hilton has been spotted kissing new lover Mark Philippousis' tennis rival Andy Roddick.

Over the weekend it was reported Australian sports ace Philippoussis had begun dating the hotel heiress and the reality TV star had been declaring she was "head over heels in love".

American gossip site pagesix.com reports Hilton and American tennis star Roddick - who dated Mandy Moore earlier this year - were "locking lips" at Las Vegas nightspot Light on Sunday.

Hilton's publicist Richard Squire has laughed off Hilton's supposed declaration for Philippoussis, saying: "The message from Paris was 'What is this all about?' It was probably just some throw-away comment.

"Tara Reid went out with Mark and she is a good friend of Paris."