Out enjoying the cold in Aspen yesterday, Paris Hilton and her BFF Brittany Flickinger posed their sexy ski outfits for the paparazzi.

The heiress and her gal pal looked to be enjoying their vacation as they stroll around town, smiling for the cameras. According to witnesses, both of the gorgeous girls enjoyed every inch of what Aspen had to offer, taking advantage of retail therapy opportunities, shopping the swanky boutiques all over town.

Is it just me, or have you also noticed that Paris’ new BFF never smiles for the camera? Check out more pictures of Paris Hilton and Brittany Flickinger in Aspen below…

Photo Credit:  PacificCoastNewsOnline.com, FamePictures.com