Michalka started work in entertainment in the 2000s, when she was a model for
catalogs. In 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 appeared on shows such as
Oliver Beene,
Six Feet Under,
The Guardian, and
General Hospital. She and her sister appeared in the MTV film
Super Sweet 16: The Movie. In 2009, she was featured in the
Peter Jackson film
The Lovely Bones, released widely on January 15, 2010. From 2009 to 2013, Michalka and her sister performed as the musical duo
78violet. They decided to change their band name back to "Aly and AJ" in 2015. She was cast as a
recurring character on
The CW series
Hellcats starring
Ashley Tisdale and her sister Aly Michalka. The series ran for one season and was cancelled in May 2011. Michalka appeared in the 2011 film
Super 8, directed by
J. J. Abrams. Her first big-screen starring role was as the title character in 2013's
Grace Unplugged. Since 2013, Michalka has had a recurring role on the ABC sitcom
The Goldbergs as Lainey Lewis, the best friend of main character Erica Goldberg and one-time girlfriend of Erica's brother, Barry. In May 2015, it was announced that she was promoted to series regular for the show's upcoming third season. She also played the Lainey character in a lead role on the spinoff series
Schooled, which ran for two seasons. In July 2014, she and her sister filmed an untitled drama in
Laurel Canyon, California. The film was directed and written by Aly's husband, Stephen Ringer. Michalka was one of the producers of the film, with her sister and Ringer, and participated in the casting process. In May 2015, it was announced that the film,
Weepah Way for Now, would premiere at the
Los Angeles Film Festival on June 16, 2015. The film was released on DVD, iTunes, and other streaming platforms in June 2016. Starting in 2015, Michalka voiced the character
Stevonnie in
Steven Universe, a fusion of the protagonist Steven and his best friend Connie. In 2024, Michalka competed in
season twelve of
The Masked Singer as "Strawberry Shortcake", with
Hayley Orrantia (who competed in
season seven as "Ringmaster") serving as her Mask Ambassador. She was eliminated in the semi-finals and finished in third place. Michalka also made references to her nephew and Aly & AJ's upcoming album. In December 2025, it was announced that Michalka was cast in season 4 of
The White Lotus. ==Personal life==