She plays the role of Jeanette Brinson in the dramatic film Wildlife.
And Carey Mulligan looked chic as she attended a Deadline event at day two of the Sundance Film Festival in Park City, Utah, on Saturday.
The actress, 32, – who welcomes her second baby just four months ago – was also joined by her Wildlife cast as they partook in a studio portrait photo shoot.
Carey sported a navy blue sweater that featured a tiny light blue ribbon supporting the American Civil Liberties Union.
The wife of Mumford and Sons frontman Marcus Mumford paired her top half with gray jeans.
Carey wore her silky blonde hair in loose waves down by her shoulders while sporting a minimal amount of makeup to accentuate her natural beauty.
The Great Gatsby star finished off her portrait look with multiple pairs of dainty hoop earrings.
Carey was joined by Wildlife costars; Ed Oxenbould, Paul Dano, Zoe Kazan and Zoe Margaret Colletti.
Later that same day, the mother-of-one sported a sleek all-black ensemble as she braved the icy Utah weather for the Sundance red carpet.
She was joined on the carpet by her on-screen husband Jake Gyllenhaal, as well as other members of their film cast.