Pop superstar Katy Perry is coming to Fox's "Raising Hope" for a guest starring role slated to air on Tues., Mar. 6 at 9:30 EST on Fox.
 In the episode, entitled "Single White Female Role Model," Perry will play Rikki, a prison attendant who claims to be a friend from Sabrina's (Shannon Woodward) past.
 âShannon Woodward is my best friend,â said Perry in an official statement from Fox. âA couple weeks ago, I was home, just toasting up a frozen chicken fillet when she called me up and asked if I wanted to do something 'fun' for a change … I thought, 'Sure, I have nothing else to do, and I like chillin' with my best friend.' … I hope [creator Greg Garcia] is not secretly sabotaging my potential future career by type-casting me in the role of just a looker, so that I would never be able to play anything more challenging."
 Meanwhile, former Disney starlet Ashley Tisdale is distancing herself from the the House of Mouse that made her famous — and landed her a few famous BFFs. Tisdale is heading to Louis CK's untitled CBS multi-camera comedy, which centers on young creatives trying to make it in dire financial times. The pilot, written by Louis CK and Spike Feresten, is actually an update of a script that they cowrote 13 years ago. Tisdale will play Petra, a "beautiful and sarcastic assistant to a vintage clothing designer," according to TV Line, who confirmed the news.
 In other casting news …
 Dennis Quaid and Michael Chiklis have scored lead roles in CBS' cowboy drama based on Ralph Lamb, a rodeo cowboy turned Las Vegas sheriff. Quaid is set to play Lamb, while Chiklis will star as a Chicago mob boss. [The Hollywood Reporter]
 "Heroes" alum Milo Ventimiglia has signed on to star in Frank Darabont's new TNT drama pilot "L.A. Noir." Ventimiglia will play Ned Stax, a young former marine who served with Joe Teague during World War II. In the pilot, Stax is a lawyer being groomed to be a fixer for the mob. [TV Guide]
 "Modern Family's" ditzy teen queen Haley Dunphy (Sarah Hyland) is getting a new boyfriend. Hyland's real-life boyfriend, Matt Prokop, has just been cast as Haley's latest love interest. [Zap2it]
 "United States of Tara" star Brie Larson has landed the female lead in Nick Stoller's CBS pilot. In the comedy, a twentysomething guy (Michael Angarano) gets his heart broken by his girlfriend (Larson), only to wind up working one cubicle away from her at an ad agency. [TV Guide]
 Former "Big Love" star Jeanne Tripplehorn has booked a two-episode arc on the Fox comedy "New Girl," which stars the adorkable Zooey Deschanel. Tripplehorn will play Russell's (Dermot Mulroney) ex-wife Ouli (Tripplehorn), who has a chilly reception to the new girl in his life — Jess (Deschanel). [The Hollywood Reporter]
 "Brothers & Sisters" star Ken Olin has been tapped to co-star in ABC's drama pilot "Americana." Olin will play Martin, the owner of a garment manufacturing company whose daughter designs clothes for the company. [The Hollywood Reporter]
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Katy Perry Heads To 'Raising Hope' & More Casting News
  