Kristen Stewart Sundance Jan. 23Twilight‘s leading lady Kristen Stewart isn’t exactly known for her cheery disposition. But the young actress did manage to show some of her pearly whites while posing for some photos with a pint-sized fan at the Sundance Film Festival in Park City, Utah, on Saturday. Kristen is pulling double duty at Sundance, promoting two upcoming films, The Runaways, co-starring Dakota Fanning, and Welcome to the Rileys, which also stars Tony Soprano himself, James Gandolfini.

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