Katy Perry, Kate Mara, Selena Gomez At Snowflake Ball

The annual UNICEF Snowflake Ball always draws a crowd of celebs in their black-tie best. This year, that crowd included Selena Gomez, Katy Perry, and more of the Hollywood set who gathered at NYC's Cipriani last night to support UNICEF’s lifesaving efforts across the globe. Selena Gomez and Katy Perry both turned up the drama in their respective evening gowns — Selena in a gold-trimmed Dolce & Gabbana and Katy in a caped Naeem Khan confection. Meanwhile, Kate Mara brought the colour in a coral-hued, lace Jason Wu gown. To see who else wowed at last night's awards, keep clicking — then tell us your pick for best dressed in the comments.