Steve Granitz / WireImage 1 / 9
Steve Granitz / WireImage 1 / 9

At one time in her life, it was all-out war between Busy Phillips and James Franco. She says that their beef even got physical at one point.

The actress appeared on "Watch What Happens Live" on Wednesday and was asked by fellow guest Jeff Lewis, form "Flipping Out," who was the most difficult person she's ever worked with.

"At the time, but we've since made amends, James Franco and I didn't really get along when we were on 'Freaks and Geeks,'" she said. "We were 19, and we really disliked each other. It's well documented, he like shoved me to the ground once. It was like really brutal, but we're friends now and we like really like each other now as adult. But as kids we did not get along."

James and Busy played boyfriend and girlfriend on screen.

Busy's call out probably isn't news to James. In 2008, he admitted to GQ that he wasn't the easiest person to deal with in those days.

"I'll admit I was not a team player. A lot of it, I think, just had to do with being obnoxious when the camera was on someone else," he said. "Maybe I'd eat a banana in the background that would take focus away from other actors. I didn't think about it that way, but now I could say, 'Look, the scene's not about me, it's about them, just chill out, James.'"

The TV show only aired one season in 1999, but that show gave Busy her only regret in life, and it had nothing to do with any of her fellow co-stars. In March she told People magazine, "My only regret in my entire life and, this is true, is that I didn't steal the blue jacket [from "Freaks and Geeks"]. It was my first professional acting job and I remember testing the waters with the costume people and asking them if I could take [the jacket], and they were like, 'Well, that's not really doneā€¦'"

She continued, "They weren't going to give it to me because it was on loan from some costume warehouse archives, so in order for me to have kept it at 19 years old -- during my first professional acting job -- I would've had to have stolen it. And as much as I was really good at playing bada-- on TV, I wasn't one in real life."