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Amanda Joy "AJ" Michalka, often credited as simply AJ, is an American actress, singer-songwriter, and musician. She was a model prior to becoming an actress, and is best known as one-half of the duo Aly and AJ with her sister Aly Michalka. AJ recorded the theme song and accompanying music video for the film Secretariat, entitled "It's Who You Are." She also issued a single and video called "All I've Ever Needed" from her 2013 film Grace Unplugged. She has also had a successful acting career, and after two seasons in a recurring role as Lainey Lewis on the ABC sitcom The Goldbergs, she has been promoted to a regular role on the series for the third season onward.