Justin Cooper (born November 17, 1988) is a former American child actor who had his motion picture debut in the comedy Liar Liar. He started acting at the age of five, appearing in Dominos Pizza television commercials and a guest appearance on the popular sitcom Full House. Later came The Boys Are Back. After two years on the daytime drama General Hospital and guest appearances on ER and The Magnificent Seven, Cooper moved on to play along beside Jim Carrey in Liar Liar. After starring in Dennis the Menace Strikes Again as the mischievous Dennis Mitchell, Justin also appeared on the sitcom Brother's Keeper. He was popular in this role, and was nominated for Best Performance in a TV Comedy Series, Supporting Male Young Actor, 1998 Youth in Film Awards. He currently works as a producer on Fox Sports Radio.