Enticing Katy has Santas in her thrall

Katy Perry reported for duty at Madison Square Garden on Friday night in a very skimpy toy soldier costume. Plus Justin Beiber picks Kim Kardashian to Selena Gomez. See more

Katy was joined by a host of other stars for the event, including Disney star Selena Gomez. The 18- year- old star, who was dressed in a low- cut black gown, performed her tracks Round and Round , A Year Without Rain , and Naturally