Chloe Grace Moretz and Rupert Grint are joining helmer Randall Miller’s “The Drummer,” an indie music biopic about Beach Boys drummer Dennis Wilson.Moretz is in final negotiations to play Wilson’s daughter Jennifer, who is co-producing the film, along with her half-brother Carl. Grint will play Stan Shapiro, a mail room intern at William Morris, who befriended Wilson during the last few years of the musician’s life. Thesps join previously announced Aaron Eckhart as Wilson and Vera Farmiga, who signed on to play Fleetwood Mac singer-songwriter Christine McVie. Slated to begin lensing June 15, “The Drummer” centers on the last six years of Wilson’s life, before his death in 1983. Miller is producing with scribe Jody Savin through the pair’s Unclaimed Freight Prods. Music industry vet Brad Rosenberger, who brought the project to the filmmakers, also produces. The deal was negotiated by Jonathan Gardner of Cohen and Gardner LLP on behalf of the producers, as well as by Moretz reps: WME’s Andrew Dunlap, Pamela Kohl of 3 Arts and Marcy Morris of Jackoway Tyerman. Christian Hodell of Hamilton-Hodell in the U.K., Gersh’s Brett Norensberg, Untitled Entertainment’s Justin Grey Stone and Warren Dern of Sloan, Offer, Weber and Dern brokered the deal for Grint.