Sundance Film Festival 2018 Parties

Courtesy Pizza Hut

The Sundance Film Festival is once again upon us.

This year's roster of indies feature some of Hollywood's biggest stars, including Maggie Gyllenhaal, Idris Elba, and Keira Knightley, all of whom took a well-deserved break from promoting their projects to hit the party circuit in their warm-weather finest.

On Main Street, aka the center of the action in Park City, Utah, Grey Goose hosted an assemblage of stars. Emma Roberts dropped by with her boyfriend, Evan Peters, to kick off his 31st birthday, greeting him with a big hug when he walked in the door. Rose Byrne chatted with her Juliet, Naked co-stars Ethan Hawke and Chris O'Dowd, as they sipped cocktails.

Across the road at Cafe Artois, Aubrey Plaza and Chloë Sevigny celebrated Sevigny's new film, Lizzie, based on the infamous Lizzie Borden murders. Further away, in the mountains, Quantico star Priyanka Chopra stopped by the MoviePass estate to talk about her new movie, A Kid Like Jake, with Claire Danes and Octavia Spencer.

VIDEO: 8 Things Celebrities Always Wear at Sundance

Scroll through below to see where all the stars let loose out west.

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Kiersey Clemons

Courtesy Pizza Hut

at the Pizza Hut lounge at IndieWire Studio on Jan. 19.

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Evan Peters and Emma Roberts

Michael Kovac/Getty Images

at the after-party for American Animals at the Grey Goose Blue Door on Jan. 19.

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Ethan Hawke, Rose Byrne, and Chris O'Dowd

Michael Kovac/Getty Images

at the after-party for Juliet, Naked at the Grey Goose Blue Door on Jan. 19.

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Aubrey Plaza and Chloë Sevigny

Phillip Faraone/Getty Images

at the after-party for Lizzie at Cafe Artois on Jan. 19.

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Tessa Thompson

Courtesy Autograph Collection

at Autograph Collection, the Black List, and Sundance Institute's 2nd Annual Power Women's Cocktail event at The Retreat on Jan. 20.

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Issa Rae

Courtesy Autograph Collection

at Autograph Collection, the Black List, and Sundance Institute's 2nd Annual Power Women's Cocktail event at The Retreat on Jan. 20.

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Priyanka Chopra

Daniel Boczarski/Getty Images

at the MoviePass Estate on Jan. 21.

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Maggie Gyllenhaal

Courtesy Autograph Collection

at Autograph Collection Hotels & the Black List's cocktail party at The Retreat on Jan. 20.

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Idris Elba

Courtesy Al Powers

at TAO Park City on Jan. 20.

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Chloë Grace Moretz

Courtesy of Kia

at the Creative Coalition's Spotlight Initiative Awards gala dinner at the KIA Supper Club on Jan. 21.

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Jaden Smith

Courtesy Dave Brewer

at the after-party for Skate Kitchen at the DIRECTV Lodge presented by AT&T on Jan. 21.

Replay gallery

Where Kiersey Clemons, Ethan Hawke, Priyanka Chopra, and More Partied at Sundance