2015 Sundance Film Festival

Park City, Utah, generates all the buzz on indie film in January. Celebs and filmmakers brave the cold and hit the slopes during the annual event. Look who showed up to this year's fest.

Winona Ryder attends the premiere of 'Experimenter.'

Olivia Thirlby at the premiere of 'The Stanford Prison Experiment,' which won the Waldo Salt Screenwriting Award.

Matt Bennett and Billy Crudup at the premiere of 'The Stanford Prison Experiment,' winner of the Alfred P. Sloan Feature Film Prize.

RJ Cyler at the premiere of 'Me And Earl And The Dying Girl,' which won the U.S. Grand Jury Prize: Dramatic.

Katherine Hughes and Olivia Cooke at the premiere of 'Me And Earl And The Dying Girl.' The film also took home the Audience Award: U.S. Dramatic.

Molly Shannon

Keanu Reeves at the premiere of 'Knock Knock.'

Cobie Smulders at the premiere of 'Results.'

Dianna Agron at the premiere of 'Zipper.'

Patrick Wilson 

John Cho

Malin Akerman at the premiere of 'I'll See You In My Dreams.'

Blythe Danner

Rhea Perlman

Leslie Bibb at the premiere of 'Digging For Fire.'

Jake Johnson

Director Joe Swanberg

Mark Duplass and Jay Duplass at the premiere of 'The Overnight.'