The music makers will appear in different episodes of the HBO comedy in August. Kravitz, 46, will play a client whom Ari (Jeremy Piven) must persuade to do a movie. Diddy, 40, will appear in a scene with series executive producer Mark Wahlberg as a potential investor in Turtle's (Jerry Ferrara) new business.
The casting was first reported by Entertainment Weekly.
Kravitz also shared a picture from the set with his Twitter followers Thursday.
Season 7 of Entourage premieres Sunday, June 27 at 10/9c.
Are you excited to see Kravitz and Diddy on Entourage?