[6] In 2004, MTV commissioned a planned reality television series Laguna Beach: The Real Orange County which followed the lives of wealthy teens and Colletti was asked to appear on the show.

[4] Upon graduating high school, he attended San Francisco State University for a year before returning to Los Angeles to pursue an acting career.

[6][7] In January 2007, it was announced that Colletti was cast in a major recurring role during the fourth season (Episode 12) of The CW teen drama series One Tree Hill.

In February 2009 Colletti portrayed the role of the love interest in the music video "White Horse" by Taylor Swift.

"[10] Colletti and fellow One Tree Hill castmate James Lafferty created and worked on the first season of an original comedy called Everyone Is Doing Great.