Eric Roberts by Charley Gallay/ Eric Roberts by Charley Gallay/

The full slate of stellar visitors on hand for the fifth season of HBO's Entourage (arriving Sept. 7) is out, and it's an eclectic bunch.

In addition to the previously announced Leighton Meester (reprising her role from Season 1, as a pop tart), Bow Wow (as Charlie, a new client of E's) and Jamie-Lynn Sigler (as herself), look for appearances by Lukas Haas and Giovanni Ribisi (playing aspiring screenwriters) and Fran Drescher and Kevin Pollak (as an obnoxious Beverly Hills couple).

Playing themselves this time around are Eric Roberts, Jeffrey Tambor, singers Tony Bennett and T.I., golfer Phil Mickelson, film critic Richard Roeper, network exec Ben Silverman, the hosts of The View and (whew) Mark Wahlberg (aka Entourage's creator/exec producer).

Returning guest stars include Carla Gugino and Beverly D'Angelo. - Matt Mitovich