Singer and actor who first appeared as JR Chandler on the soap opera All My Children. He later joined the boy band Dream Street before branching into a solo career. McCartney's band's self-titled debut album went Gold in 2001.
He joined the national King and I tour when he was ten and joined the American pop boy band Dream Street five years later.
He voice-acted as Theodore in the Alvin and the Chipmunks franchise.
He was born to Ginger and Scott McCartney, who encouraged him to perform in local community musicals when he was seven. He is an older brother to siblings Lea and Tim. He proposed to Katie Peterson in September 2019; the two wed in October 2021.