09/17/2012 01:28 pm ET Updated Sep 17, 2012

Sean 'Diddy' Combs Books 'It's Always Sunny In Philadelphia' And More Casting News

Diddy's headed to the sunniest city around!

Hip-hop icon Sean Diddy Combs is headed to FX's "It's Always Sunny In Philadelphia," according to THR.

Although FX is staying mum on the details of his character, he's scheduled to start filming on Mon., Sept. 17.

In addition to recent rumors that he would be judging "American Idol,"
Combs has appeared on "Hawaii Five-0" and "CSI: Miami."

In other casting news...

Margo Harshman is "Big Bang Theory"-bound. The "Bent" actress will appear on the CBS comedy as Sheldon's (Jim Parsons) new assistant Alex and possible love interest for Leonard (Johnny Galecki). [TVLine]

Jeff Garlin is stopping by Season 4 of "Arrested Development."
Garlin's character Mort Meyers will be hanging with the Bluths in the show's new season. “I can’t give you any details, but I can tell you I have been filming,” he said. [Paste]

Annie Potts is starring in "Paging Dr. Freed."
Potts will play the mother of two gynecologist brothers, played by David (Kyle Howard) and Jonathan (David Moore) in USA pilot. [Deadline]

Jenna Dewan has joined the cast of "Witches Of East End." The "American Horror Story: Asylum" actress will portray an ex-party girl who calms down when she gets engaged to a rich philanthropist in the Lifetime pilot. [TVLine]

Nikki Blonksy is headed to "Smash."
The "Hairspray" actress has joined the Broadway-centered NBC show for its second season, with details of her character still to come. [Hollywood Life]

Where We Left Off And What's Ahead For Your Favorite Shows