The cast of an upcoming comedy spin-off is starting to round out its cast. According to Entertainment Weekly, Rose Byrne, Elizabeth Moss and Sean "Diddy" Combs have all come aboard Get Him to the Greek for Universal Pictures.

The film is a spin-off of last year's comedy Forgetting Sarah Marshall, which features Russell Brand reprising his role as rocker Aldous Snow, who, after relapsing back on drugs, is accompanied by a recent college graduate/insurance adjuster named Aaron (Jonah Hill) who helps him make it to the Greek Theater in Los Angeles for a gig. Byrne will play a pop singer temptress named Jackie Q, a role that Emily Blunt was rumored to have landed, Moss will play Aaron's girlfriend, Daphne Banks and Combs will play the role of Sergio.

Nicholas Stoller, who directed Forgetting Sarah Marshall, is directing the spin-off from his own script. Production is scheduled to begin in August.

Get Him to the Greek was released June 4th, 2010 and stars Russell Brand, Rose Byrne, Tyler McKinney, Zoe Salmon, Lino Facioli, Lars Ulrich, Mario López, Pink. The film is directed by Nick Stoller.