Amanda Joy "AJ" Michalka is an American actress, singer-songwriter, and musician. She was a model before 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.
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