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Corbett was born in Wheeling, West Virginia, the son of John Joseph Corbett, Sr. He attended Wheeling Central Catholic High School and Cerritos College in Norwalk, California. Corbett was raised Catholic but is now a born-again Christian.[2] Corbett has never been married but has been in a relationship with Bo Derek for the past few years.

His first major role was as the hippie boyfriend of Karen Arnold in season 1, episode 4, ("Angel"), of The Wonder Years, in 1988. Corbett has co-starred in two successful television series to date: Northern Exposure from 1990 to 1995 and Sex and the City (spanning 22 episodes from 2001 to 2002). In addition, he starred in two short-lived television series. The first was a 1997 sci-fi series entitled The Visitor. Corbett starred as Adam MacArthur, a man abducted by aliens, only to find his way home, 50 years later, endowed with unearthly powers. In 2003, he starred in his second series entitled Lucky, which was about a professional poker player, Michael 'Lucky' Linkletter, living in Las Vegas.

Corbett's movie credits include My Big Fat Greek Wedding (2002), Raising Helen (2004), Bigger Than the Sky (2005), Dreamland (2006), and The Messengers (2007). Corbett also appeared in the movie Serendipity with John Cusack and Kate Beckinsale and played the role of a music teacher in the movie, Raise Your Voice, which starred Hilary Duff. He also had a cameo role as Ken Roloff in Dinner Rush (2000). Additionally, Corbett starred in the 2007 Lifetime Television film Montana Sky, and co-star's as an LAPD vice squad member in Street Kings 2008.

Corbett released a full-length, self-titled country music album on April 4, 2006, and went on tour that year to promote the album. Its only single, "Good to Go" (which was also recorded by Jason Aldean on his self-titled debut album) reached a peak of #48 on the Billboard Hot Country Songs charts. In addition, Corbett has also been featured as a primary actor in Trisha Yearwood's music video of her 2008 Country single, "This Is Me