His father, R. James, teaches philosophy at Fairfield University.
Has a older brother, Damien Long who is an actor. He also has a younger brother, Christian Long who is also a actor.
Was named one of People magazine's hottest bachelors of 2006. He was also named among Entertainment Weekly's "30 Under 30: The Actors" List of 2008.
At his senior year at Fairfield Prep, he was named the "Most likely not to be seen in class".
His mother, Wendy Lesniak, is a stage actress who also teaches at Roger Ludlowe Middle School in Fairfield, Connecticut.
Was in the movie The Break-Up, which premiered on his birthday.
Lives in New York City when he is not filming on location.
Constantly asked about his kiss with Britney Spears in the movie Crossroads, even his own grandmother demanded details.
After dating for 10 months since 2007, he and Drew Barrymore broke up in Summer of 2008. Justin was supposed to appear in her directorial debut, Whip It but backed out citing he was still upset with the break-up.
Read for the Stephen King's audiobook "Everything's Eventual: Five Dark Tales."
Did a TV commercial for Pepsi Vanilla in 2003.
Admits that the reason he went into acting was because he thought it was a great way to meet girls in high school.
As a child, he idolized John Cusack, Matthew Broderick, and Michael J. Fox. It came to a point that he was so obsessed with Fox that he naturally picked up most of his mannerisms and hand gestures.
He grew up in a conservative Catholic family and his parents were strict about the movies they watched.
Growing up, he wanted to be a professional football player. It was in high school when he realized that with his small frame and inadequate height, his dream wasn't going to materialize.
Playing a computer geek/hacker, his most difficult line in the movie Live Free or Die Hard was "mutating encryption algorithm."
In May of 2006, Justin Long co-starred with John Hodgman in a new ad campaign for Apple computers.