EXCLUSIVE: Rosemarie DeWitt has joined the cast of Lionsgate’s La La Land, Damien Chazelle’s musical film set in contemporary Los Angeles and starring Ryan Gosling as a jazz pianist and Emma Stone as the aspiring actress he falls in love with. Dewitt is set to play Gosling sister in the pic, which follows Gosling and Stone’s characters as they discover that balancing love and art in such the cutthroat climate of LA isn’t easy.

The Lionsgate/Summit pic has already set a July 15, 2016 release date. JK Simmons, Sonoya Mizuno, Jessica Rothe and Callie Hernandez co-star.

DeWitt, who starred opposite Sam Rockwell in Fox’s Poltergeist remake that hit theaters in May, is next up in Digging For Fire, the Sundance pic directed by Joe Swanberg that was picked up by The Orchard for U.S. distribution after its Park City bow. Her recent credits include Jason Reitman’s Men, Women, And Children and Universal’s Kill The Messenger opposite Jeremy Renner.

DeWitt is repped by CAA and Wishlab Inc.