Sources on the Entourage set tell PerezHilton.com that the goldenest of all boys, Michael Phelps, will be guest starring on the upcoming season of Entourage.

Phelps is in the NYC right now shooting his bit with the boys, who are filming on location!

Michael will appear in the season finale of the show, so we'll have to wait a while to see his cameo.

 Entourage Season 4 Recap

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Rapper/'actor' Bow Wow will be joining the boys on Entourage in season 5, according to the Hollywood Reporter.

Bow Wow has been cast as Charlie, a new stand-up comic client of E.

Bow Wow tells the Reporter that he's going to focus on acting full time because wants to be like Will Smith. He says, "After 16 years in the music industry and six successful albums, I've decided to shift my energy to something else I'm passionate about, acting. I'm going to try to be the next Will Smith."