Starz has acquired U.S. distribution rights to the comedic love story “Tumbledown,” starring Rebecca Hall and Jason Sudeikis, and set a Valentine’s weekend release. The film premiered last month at the Tribeca Film Festival. Dianna Agron, Blythe Danner, Griffin Dunne, Joe Manganiello and Richard Masur also star. “Tumbledown” is Sean Mewshaw’s feature directorial debut.