There's a chill in the air and last week's snow means winter gala season has officially started. This week's parties start tonight in Chelsea with the DIA Arts Foundation Gala chaired by Nathalie de Gunzburg and Miuccia Prada. Of course you want to look your best, but let's face it- no one likes having to put on a sheer, strapless dress in 30 degree weather. Take a cue from Hollywood's sexiest starlets and try these tricks for looking chic and staying warm.