Stars attend the 2017 Sundance Film Festival

Harvey Weinstein and Jay Z attend "The Kalief Browder Story" world premiere at the Sundance Film Festival in Park City, Utah, on Jan. 25, 2017.

Kerry Washington attends the "Crown Heights" Premiere at Library Center Theater in Park City, Utah, on Jan. 23, 2017.

Elle Fanning attends the 2017 Sundance Film Festival premiere of "Sidney Hall" in Park City on Jan. 25, 2017.

Shailene Woodley attends the Standing Rock Event at Zoom Restaurant in Park City, Utah, on Jan. 23, 2017.

Connie Britton attends the "Beatriz at Dinner" premiere at Eccles Center Theatre in Park City, Utah, on Jan. 23, 2017.

Salma Hayek and producer Aaron L. Gilbert attend the "Beatriz at Dinner" premiere at Eccles Center Theatre in Park City, Utah, on Jan. 23, 2017.

Michelle Monaghan attends the 2017 Sundance Film Festival premiere of "Sidney Hall" in Park City on Jan. 25, 2017.

Water.org co-founders Gary White and Matt Damon discuss the global water crisis for Stella Artois' Buy a Lady a Drink campaign during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Mark Hamill attends the "Brigsby Bear" premiere at Eccles Center Theatre in Park City, Utah, on Jan. 23, 2017.

America Ferrera attends the "GENTE-FIED" premiere at Egyptian Theatre in Park City, Utah, on Jan. 23, 2017.

Common attends the "Burning Sands" film premiere at the Sundance Film Festival in Park City, Utah, on Jan. 24, 2017.

Kimberly Steward, Pat Mitchell, and Kerry Washington attend the 2017 Women at Sundance Brunch on Jan. 23, 2017.

Shirley MacLaine attends "The Last Word" film premiere at the Sundance Film Festival in Park City, Utah, on Jan. 24, 2017.

Nnamdi Asomugha attends the "Crown Heights" Premiere at Library Center Theater in Park City, Utah, on Jan. 23, 2017.

Jay Duplass, actress Connie Britton, actor John Lithgow and actress Chloe Sevigny attend the "Beatriz at Dinner" premiere at Eccles Center Theatre in Park City, Utah, on Jan. 23, 2017.

Lisa Kudrow attends the "GENTE-FIED" premiere at Egyptian Theatre in Park City, Utah, on Jan. 23, 2017.

Nick Offerman attends the Movie That Blew My Mind Goes Environmental Panel at Filmmaker Lodge in Park City, Utah, on Jan. 23, 2017.

Elijah Wood attends the "78/52" premiere at Egyptian Theatre in Park City, Utah, on Jan. 23, 2017.

John Lithgow attends the "Beatriz at Dinner" premiere at Eccles Center Theatre in Park City, Utah, on Jan. 23, 2017.

Kathryn Hahn and America Ferrera attend the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 22, 2017.

RELATED: See the stars at Women's March events around the world

Keanu Reeves arrives at the "To the Bone" premiere at the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

RELATED: Memorable Sundance Film Festival fashion moments

Chloe Sevigny attends the "Golden Exits" premiere at the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

RELATED: Stars who've transformed their looks over the last decade

Jon Hamm attends the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 23, 2017.

Charlize Theron signs the wall at The Vulture Sundance Spot at Rock & Reilly's during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Kevin Bacon attends the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 22, 2017.

Lily Collins arrives at the "To the Bone" premiere at the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

Jenny Slate, Jason Schwartzman, Jack Black and Rashida Jones pose at the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 22, 2017.

Elizabeth Olsen arrives at the "Wind River" premiere party at the Acura Studio during the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

Jeremy Renner arrives at the "Wind River" premiere party at the Acura Studio during the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

Kristen Stewart attends the "Come Swim" premiere at the Sundance Film Festival in Park City, Utah, on Jan. 19, 2017.

Alfre Woodard and Peter Dinklage attend the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 23, 2017.

Jack Black and Jason Schwartzman attend "The Polka King" premiere at the Sundance Film Festival in Park City, Utah, on Jan. 22, 2017.

Justin Verlander and fiancée Kate Upton sign the wall at The Vulture Sundance Spot at Rock & Reilly's during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Geena Davis attends the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 23, 2017.

John Legend signs the wall at The Vulture Sundance Spot at Rock & Reilly's during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Laura Prepon and fiance Ben Foster in a jacket by Moose Knuckles arrive at the premiere of "The Hero" at the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Matt Bomer arrives at the "Walking Out" premiere during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Dave Franco and fiancée Alison Brie get cozy at a cast party for "The Little Hours" hosted by Chase Sapphire during the Sundance Film Festival in Park City, Utah, on Jan. 19, 2017.

Jon Hamm attends the "Ingrid Goes West" party in the Stella Artois Filmmaker Lounge during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Brittany Snow arrives at the Kia Supper Suite for the XYZ Party during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Garrett Hedlund poses at the Variety Studio at Sundance Sponsored by Tim Tam in Park City, Utah, on Jan. 21, 2017.

Judy Greer poses at the Variety Studio at Sundance Sponsored by Tim Tam in Park City, Utah, on Jan. 22, 2017.

Sean Hayes poses at the Deadline Hollywood Studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 21, 2017.

Jack Huston and girlfriend Shannan Click arrive at the premiere of "The Yellow Birds" during the Sundance Film Festival in Park City, Utah, on Jan. 21, 2017.

Aubrey Plaza attends the "Ingrid Goes West" party in the Stella Artois Filmmaker Lounge during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Riley Keough attends the premiere of "The Discovery" during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Jason Segel attends the premiere of "The Discovery" during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Rooney Mara attends the premiere of "The Discovery" during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Dianna Agron attends the "Novitiate" party in the Stella Artois Filmmaker Lounge during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.

Al Gore attends the Sundance Film Festival premiere for "An Inconvenient Sequel" in Park City, Utah, on Jan. 19, 2017.

Jaime King attends the Deadline Hollywood Portraits studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 20, 2017.

Jemima Kirke attends a cast party for "The Little Hours" at Chase Sapphire on Main in Park City, Utah, on Jan. 19, 2017.

Tavi Gevinson and Ashley Connor attend the IndieWire Opening Night Party at the Sundance Film Festival in Park City, Utah, on Jan. 19, 2017.

Robert Redford attends the Sundance Film Festival Redford Press Conference in Park City, Utah, on Jan. 19, 2017.

Jason Ritter attends the Deadline Hollywood Portraits studio at Sundance Presented by Applegate in Park City, Utah, on Jan. 20, 2017.

Laura Dern attends the premiere of "The Discovery" during the Sundance Film Festival in Park City, Utah, on Jan. 20, 2017.