Life and careerMendler was born on December 18, 1992 Washington, D.C. and moved with her family to the San Francisco area town of Mill Valley at age eight. It was there where she first expressed interest in acting and began working in plays. She became the youngest performer in the San Francisco Fringe Festival. She has a younger brother, named Nick.
In 2008, Mendler played the role of Kristen Gregory in the film The Clique. In 2009, Mendler guest starred as Nick Jonas's love interest on the series premiere of Jonas. That same year, she co-starred with Lindsay Lohan in the film Labor Pains.
She has also guest-starred in eight episodes of Wizards of Waverly Place as Juliet Van Heusen, a vampire that Justin Russo (David Henrie) falls in love with. She currently stars in the Disney Channel Original Series Good Luck Charlie, which premiered on April 4, 2010. Her other filmography credits include Alice Upside Down and Alvin and the Chipmunks: The Squeakquel.
Her credits as a singer include the theme song for Good Luck Charlie, entitled "Hang in There Baby". She also sang a cover of "When She Loved Me" from Toy Story 2 for DisneyMania 7. She recorded a song for the Disney film Tinker Bell and the Great Fairy Rescue, called "How to Believe". In late 2010, Mendler wrote and performed the song "This Is My Paradise" for the motion picture Beverly Hills Chihuahua 2. It premiered on the Disney Channel on December 19, 2010. As of March 31, 2011, Mendler has signed with Hollywood Records.