Known for co-writing songs such as "California Gurls," "Teenage Dream," and "Last Friday Night (T.G.I.F.)," all hits by Katy Perry.
She started singing when she was four years old and, by age seven, was receiving classical piano training. She joined the Seattle Girls Choir Prime Voci when she was 12.
Her acting career landed her roles in films such as August Rush and TV shows like CSI: NY and American Dreams.
She grew up in a musical family.
She's collaborated with numerous artists, including Britney Spears, Cher, Ellie Goulding, and Adam Lambert.