Amanda Joy Michalka, often credited as AJ, is an American actress, singer-songwriter, model, and musician who is best known as one-half of the duo Aly & AJ (formerly "78violet") with her older sister, Alyson.

She played Courtney Callum in the 2006 Disney Channel Original Movie, Cow Belles, along with Alyson, who played Taylor Callum.

Disney Roles