If newly platinum blonde Mary-Kate Olsen was a reindeer, she'd be "Vixen". The New York Post reports that the mini-mogul was spotted holiday partying at Hollywood's Chateau Marmont. Sister Ashley ("Cupid") stayed by Mary-Kate’s side as she flirted with a handsome male model. The twins and their look-alike entourage (all wore oversize sweaters, beanies and very high heels) drank and chain-smoked until the early morning hours of Christmas Eve.

On the opposite coast, Lindsay Lohan -- the reindeer formerly known as "Blitzen" -- partied at New York City club Lotus. The actress hung out with socialite-turned-reality star Brittny Gastineau ("Prancer") and danced, but did not drink, the night away. She even declined numerous rounds of drinks sent to the table free of charge. Lohan left the club at approximately 3 a.m., grabbing a late night snack from a nearby hot dog vendor.