Judd Apatow is filling out the cast for his next directorial effort, with Bridesmaids star Chris O’Dowd, Lena Dunham (director of Tiny Furniture), Charlyne Yi (Knocked Up) and Wyatt Russell currently in negotiations to join the untitled ensemble comedy. Written by Apatow, the film is a spinoff of sorts from his 2007 comedy Knocked Up, focusing on Paul Rudd and Leslie Mann’s characters. Variety reports that O’Dowd and Dunham will play employees of Rudd’s indie record company, Russell will portray a hockey player, and Yi will reprise her role as Jodi from Knocked Up.The cast for the untitled comedy currently includes Rudd, Mann, Megan Fox and Albert Brooks. O’Dowd is just coming off the massive success of the Apatow-produced Bridesmaids. His turn as Wiig’s love interest in the film has him fielding a flood of offers, and deservedly so. No other plot details on Apatow’s flick are known at the moment, but it’s set to be released in December 2012.