Star Sightings: The 2013 Sundance Film Festival

Ashton Kutcher attends the jOBS premiere during the 2013 Sundance Film Festival on January 25, 2013 in Park City, Utah.

Michael Polish and Kate Bosworth give a perfect pose at the premiere of Big Sur.

Critical darlings Elizabeth Olsen and Dakota Fanning hit up their new film Very Good Girls' after party together.

Lovelace stars Peters Sarsgaard and Amanda Seyfried attended the film's Grey Goose Blue Door party.

Chris Noth posed with the forever youthful Adam Brody also at the Lovelace party.

January Jones looked ravishing in red at the Sweetwater official cast and filmmakers party.

Michael Cera smiled big in an adorable Fair Isle sweater at the Photo Studio for MSN Wonderwall at ChefDance.

Leslie Bibb and Riki Lindhome made a Paul Scheer sandwich at the Samsung Galaxy Lounge at Village at the Lift.

Evan Rachel Wood and Shia LaBeouf supported their latest film, The Necessary Death Of Charlie Countryman, at its highly anticipated Sundance premiere.

Emile Hirsch and Paul Rudd made an appearance at the Grey Goose Blue Door Cocktail Party for their film Prince Avalanche.

A bundled-up Maya Rudolph also hit up the Grey Goose Blue Door Prince Avalanche Cocktail Party to support her fellow famous pals.

A-listers Joseph Gordon-Levitt and Julianne Moore made a pair of stylish stars at the Don Jon's Addiction premiere party hosted by DirecTV and the Sundance Channel.

James Franco obviously had fun playing with the latest Samsung tech products at The Samsung Galaxy Lounge at the Village at the Lift.

Shailene Woodley took home a fashionable pair of brown boots at the Carlo Pazolini room at the Miami Lounge.

90210 star AnnaLynne McCord looked picture perfect in the snow at the New Era Chalet at Village At the Lift. 

Jessica Biel and her Sundance cast at Variety Studio struck some goofy poses at the CIROC photo booth.

The Hollywood Reporter hosted a cocktail party in honor of Naomi Watts at the Samsung Galaxy Lounge, where she posed with guests Desiree Gruber and Kyle MacLachlan.

Samsung hosted a dinner for the casts of two Sundance-released movies, Touchy Feely and We Are What We Are, where guests dined on a dinner prepared by celebrity chef Ludo Lefebvre. Stars in attendance included Ellen Page, Ron Livingston, Allison Janney, Kelly McGillis, Rosemarie DeWitt and Ambyr Childers. 

Octavia Spencer got her glam on at the CoverGirl Beauty Bar sponsored by Sean John Clothing at The TR Suites.

Pretty Little Liars star Troian Bellisario got her hair styled by celebrity stylist Matt Fugate and tried out the new Dove Color Care Collection at the Dove Hair Color Care Salon at Sundance.

Courtney Love said she was "obsessed" when she tried out new drink Tea of a Kind.

Matthew McConaughey was just one many A-listers who enjoyed a meal by Chef Ludo Lefebvre, who cooked at the Samsung Galaxy Lounge.

Alexander Skarsgard looked sexy in a pair of shades at the Village at the Lift.

No diva behavior here. Jennifer Hudson and Alicia Keys struck a friendly pose together at the Village at the Lift.

Rooney Mara made a rare appearance at the NYLON + ASOS Celebrates Ain't Them Bodies Saints dinner.

Nicole Kidman and Mia Wasikowska were party pals at the Goose Blue Door party for Stoker and The East.

Director Liz W. Garcia and Kristen Bell were all smiles at the MSN Wonderwall photo booth at ChefDance.

A scruffy Daniel Radcliffe and an intense looking Ben Foster attended the Grey Goose Blue Door Kill Your Darlings Cocktail Party.

A hipster chic Josh Hartnett made an appearance at the Grey Goose Blue Door Look Of Love Dinner.

Victoria's Secret supermodel Alessandra Ambrosio was happy to lace up her snow boots at the Oakley Learn to Ride in Collaboration with New Era event at Sundance this weekend.

A very handsome, glasses-clad Matthew Goode attended the star-studded Grey Goose Blue Door party.

Entourage star Adrian Grenier arrived after a day of snowboarding to wrap up his Saturday afternoon at the Miami Lounge by listening to some tunes courtesy of Skullcandy.

Brothers Christopher and Danny Masterson partied it up at Tao Nightclub at Sundance, where Danny took over the DJ booth.