MARK WAHLBERG

The 37-year-old executive produces the series - based around his own life as a Hollywood actor.

And now he'll join the all-star cast including Adrian Grenier, Kevin Dillon, Kevin Connolly and Jeremy Piven on screen when its fifth season premieres in the U.S. this Autumn (08).

Wahlberg has signed on to appear in three episodes of the comedy.

He says, "I did one other cameo in the pilot (first episode) but I didn't get to do a scene with Jeremy Piven. This time it's me and Piven going at it, so it was fun."

Source: WENN