Amanda Joy Michalka (born April 10, 1991), often credited as AJ, is an American actress, singer-songwriter, and instrumentalist. She used to be a model prior to becoming an actress, and is best known as one-half of the duo Aly & AJ (briefly known as 78violet) with her sister, Alyson Michalka. Michalka lived and grew up in Seattle, Washington and Southern California with her sister Alyson Michalka. Her mother, Carrie, is a musician and performed with JC Band. Read more on Last.fm