Saoirse Ronan will star in Greta Gerwig‘s drama “Lady Bird.”

Ronan is playing a high-school senior in the film set in Sacramento. Gerwig will direct from her own script. IAC Films is financing “Lady Bird” with Scott Rudin, Eli Bush and Evelyn O’Neill producing.

The 21-year-old Ronan just receiving an Academy Award best actress nomination. She also nabbed Golden Globe, BAFTA and SAG nods for “Brooklyn,” in which she portrays a young Irish woman who emigrates to New York City in the early 1950s. She also received an Oscar nom for best supporting actress for the 2007 drama “Atonement.”

Ronan’s other credits include “I Could Never Be Your Woman,” “City of Ember,” “The Way Back,” “The Host,” “How I Live Now”  and Wes Anderson’s comedy “The Grand Budapest Hotel.” Ronan will make her Broadway debut this spring in Arthur Miller’s “The Crucible,” which Rudin is also producing.

Gerwig broke out in Noah Baumbach’s 2010 comedy “Greenberg” and co-wrote and starred in Baumbach’s “Frances Ha” and “Mistress America.” Gerwig is also starring in the upcoming drama “Jackie” as one of Jacqueline Kennedy’s former aides.

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Ronan is represented by CAA and Macfarlane Chard. Gerwig is repped by UTA, Management 360 and Felker Toczek Suddleson Abramson. The news was first reported by Deadline Hollywood.