Amanda Joy Michalka is an American actress, musician and singer-songwriter who is best known as one half of the musical duo Aly & AJ, alongside her older sister Aly Michalka. She has appeared in films such as The Lovely Bones (2009), Secretariat (2010), Super 8 (2011), Grace Unplugged (2013), Weepah Way for Now (2015), and Support the Girls (2018). Michalka also starred in the ABC sitcom The Goldbergs (2013–2023) and its spin-off series Schooled (2019–2020). She is also known for voicing a lead role as Catra in the Netflix animated adventure series She-Ra and the Princesses of Power (2018–2020).

Aly & AJ is an American pop rock duo consisting of sisters Aly Michalka and AJ Michalka from Torrance, California. They signed with Hollywood Records and in 2005, they released their debut album Into the Rush. The album was certified Gold by the RIAA and contained the singles "Rush" and "Chemicals React". They followed this release with the albums Acoustic Hearts of Winter (2006) and Insomniatic (2007). The latter contained the Platinum single "Potential Breakup Song", which was a top 20 hit on the Billboard Hot 100.