Brian Austin Green joins 'Anger Management' cast as Charlie Sheen's nemesis

brian-austin-green-wedding-band-episodic-tnt-325.jpg"Beverly Hills 90210" alum Brian Austin Green has been upgraded from guest star to full-time regular on the FX comedy "Anger Management."

Green first appeared as Sean, the nemesis of Charlie Goodson ( Charlie Sheen), in the show's premiere episode and recently returned in the episodes "Charlie Breaks Up with Kate" and "Charlie & the Secret Gigolo."

"Anger Management" is going through a bit of a shake-up following the dramatic departure of co-star Selma Blair.

The series -- Sheen's follow-up to CBS hit "Two and a Half Men" -- has also suffered from disappointing ratings after FX gave it a 90 episode order following a 10 episode trial run.

Green recently starred on the TBS comedy "Wedding Band," which was canceled after a single season, and guest starred on ABC's also canceled "Happy Endings."
Photo/Video credit: FX