Corbett was born in Wheeling, West Virginia, the only child of Sandra "Sandy" (née Pavilack) and John Marshall Corbett. His parents were married in 1963 when Corbett was two. He grew up in an apartment block near the Ohio River with his mother and stepfather, both of whom worked at his uncle Phillip's music club. Corbett was raised Catholic, and was an altar boy for seven years at St. Joseph's Cathedral. His father, who is of part Irish descent, was born and raised in Bellaire, Ohio, and was a member of the Jehovah's Witnesses. Corbett's mother was Jewish (of part Russian Jewish descent).