Paris Hilton surprised fans on the Ellen DeGeneres show by dressing up in a sexy santa costume.

The heiress popped out from underneath a hot toddy mug wearing a short red Christmas outfit.

After giving Paris an affectionate hug, Ellen joked: "I had no idea it was you under there these past 12 days."

"I know, it was really hard work," Paris quipped.

The socialite even admitted that her dogs have their own Christmas tree and that it was pink.

After being told that the outfit suited her, Paris admitted: "Yeah I've already asked for it."

See a not so modest Paris below