Amanda Joy "AJ" Michalka (born April 10, 1991), often credited as 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 78violet (formerly Aly & 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 is being promoted to a regular role on the series for the third season onward.