Aly & AJ are a teen pop duo consisting of sisters Alyson Renae "Aly" Michalka and Amanda Joy "AJ" Michalka. They were born in Torrance, California, but spent part of their childhood in Seattle, Washington.

They are both actresses, singer-songwriters, and guitarists. Their latest album, Insomniatic, was released on July 10, 2007. MTV also premiered their latest movie, Super Sweet 16: The Movie, on July 8, 2007.

Amanda Michalka was born in Torrance, California on April 10, 1991. She and her older sister, Alyson Michalka, and their parents moved to Seattle. There her parents made sure they were exposed to all varieties of music. They then moved back to Southern California, where they still live.

Michalka was in a number of WORD Music productions at her church in Southern California as a young child. Michalka plays a variety of instruments such as acoustic guitar, electric guitar, piano, and bongos.

In March 2006, she made her Disney Channel debut in the Disney Channel Original Movie Cow Belles, as "Courtney Callum", along with sister Aly, as "Taylor Callum". She has also made appearances on shows such as Oliver Beene, Six Feet Under, The Guardian, and General Hospital.