"We're friends. We've always been friends," said Thornton, whose new memoir, "The Billy Bob Tapes: A Cave Full of Ghosts," includes a foreward written by Jolie. "See, in the press, ladies and gentleman, if you get a divorce, everyone assumes that it was nasty, and it's just not always."
"It's not that I haven't had a couple of nasty ones, you know, but this was not one of them," joked the actor, who has been married five times. "Angie and I are great friends, we always have been, and we talk on a pretty regular basis."
In an interview with ABC's "Nightline" last week, the Oscar-winning actor admitted that he "blew it" with Jolie -- who's currently engaged to Brad Pitt -- because he didn't think he was "good enough for her."
Since 2003, Thornton has been in a relationship with make-up artist Connie Angland, with whom he had a daughter.
Click through the slideshow below for other celebrity exes who remained friends post-split.
Courteney Cox and David Arquette tied the knot in 1999 before separating 11 years later and filing for divorce in mid-June. But the two actors are both fully supportive of each other.
Although Demi Moore and Ashton Kutcher's marriage came to blows after the "Two and a Half Men" star allegedly strayed from his vows, the pair were spotted looking quite amicable at a pre-Golden Globes party. (Getty)
This pair's on-screen brother-sister relationship may be heating up on "Dexter" (seriously!), but the ex-couple is also friendly when they're not trying to catch Miami's newest serial killer in town. (Getty)
In December 2010, Debra Messing and Daniel Zelman split after 10 years of marriage.
Reese Witherspooon and Ryan Phillippe found young love in 1999 before welcoming a son and daughter. But things weren't a typical Hollywood ending for the pair -- they split eight years later. The duo is still more than amicable as they co-parent their two children.
This power couple married in 1987 and welcomed three daughters before calling it quits in 2000. But the happy family is still very much a unit -- Bruce even poses with the kids, Demi and Demi's subsequent husband, Ashton Kutcher, on the red carpet!
Orlando Bloom and Kate Bosworth made quite an attractive pair and got pretty serious with their relationship before calling it quits. Maybe with their incredible looks combined, they were just too hot to handle. But you can still catch the duo hugging it out when they run into each other in Hollywoodland.
After Karen Elson appeared in the White Stripes' music video "Blue Orchid," the chemistry was undeniable. The pair tied the knot in 2005 before calling it quits six years later. But they definitely ended on an amicable note -- they even threw a divorce party!
The collision of the prince and princess of teen pop came when Miley Cyrus and Nick Jonas made sweet music on and off the stage. But the teen pop-star world is too small for any hard feelings -- the pair is still more than friendly on the red carpet. How mature!
They were the couple to beat on the Upper East Side but the on-screen "Gossip Girl" drama between Blake Lively and Penn Badgley seemed to spill off-screen into their real-life romance. But the show must go on! The pair still remains friends on and off set.
This rockstar and pop princess collided in 2008 before calling off their whirlwind romance three years later. But the pair did get one thing out of their short-lived union -- baby boy Bronx. The couple still remains close in an effort to make things as normal as possible for their young son.
Fran Drescher and Peter Marc Jacobson were married for 11 years before Jacobson admitted that he was, in fact, gay. Although it was shocking at first, Drescher finally got over her ex-husband's confession and now admits that they are the best of friends.
The ultimate fun couple may have split after dating for three years but that didn't stop them from still having a ball. The pair even starred together in "Bad Teacher" and played each other's love interests -- and apparently it wasn't awkward at all!
This former Playboy Mansion fixture and her Lothario lover, Hugh Hefner, made good TV while it lasted on "The Girls Next Door." But there were definitely no hard feelings for this ex-couple -- Kendra married Hank Baskett at the Playboy mansion!
After three years of marriage, these punk rockers called it quits -- but Avril still insists that they remain quite close.