File this in the Casting News We Never Saw Coming Department...

Ashley Tisdale - an actress best known for kid-friendly turns in High School Musical and Hellcats - has signed on for multiple episodes of Sons of Anarchy Season 5. The 26-year old will portray an escort named Emma Jean who somehow gets involved with SAMCRO.

Sons of Anarchy will return this fall with new episodes, focusing on the club under the rule of its new President, Mr. Jax Teller.

Billy Brown was also recently cast on the FX smash. He'll come on board as August Marks, the right-hand man of Harold Perrineau's Damon Pope. Elsewhere, Jimmy Smits will play the key role of an unlikely, dangerous mentor for Jax.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.