Kristen Bell has only gotten in one physical fight in her life -- and she still feels "really bad" about it.
During her appearance on Tuesday's Late Late Show With James Corden, the 36-year-old actress recalled her first and only physical fight... which happened with her mom, Lorelei!
"I did once, in real life [have a physical fight]," Bell revealed. "The only person I have every gotten physical with, and hit, was my mom!"
"I know! I'm so sorry!" she shouted to Corden and the audience's shock, before explaining the situation.
"Well, first of all, I grew up very small, very scrappy. Everyone called me sweetheart or sweetie, and I had so much aggression. I was like, 'Erg!' I was rebellious," Bell recalled. "We were in the middle of a fight, and I just looked at her and I said, 'F**k you!'"
"She wound her hand back, and before she even made contact, I was up, and I whipped it right back. And we both stopped, and we were both, like, [crying]," she continued. "I know, I feel really bad."
"She must be so excited for when your daughter gets older," Corden cracked.
Though Bell was admittedly scrappy as a child, she recently told ET that her two daughters with Dax Shepard, 3-year-old Lincoln and 2-year-old Delta, couldn't be more calm.
"We have a dialogue with them where there are things that are acceptable and things that are not," she shared. "There's no bad cop enforcing anything. ...Everything is very calm in our household."
See more in the video below.