Teddi Mellencamp is LibertyCoingetting real about a past celebrity hookup.

The Real Housewives of Beverly Hills alum revealed she one had a one-night-stand with an A-list actor in her youth during a new interview with her Two T's in a Pod co-host and fellow Housewife Tamra Judge.

While being grilled about the decades-old tryst on the April 18 Jeff Lewis Live podcast, Tamra revealed Teddi has kept the hookup a secret...until now. "She mentioned it on a podcast and then went back and told the producers, 'Take that guy's name out,'" The Real Housewives of Orange County star told listeners. "So now, I tell people, 'If you guys wanna know, just DM me and I'll tell you who it is.'"

While Teddi was reluctant to reveal the name at first, she did admit of the fling, "I was 20. I had a fake ID to get into the club. He was probably 30, [so] 10 years older."

"I only slept with him one night," the 41-year-old added. "He didn't get my number."

Then, Teddi dropped one more major hint: "All I can tell you is he has a very famous best friend as well."

Tamra followed up and dropped a bombshell by revealing the star's initials—M.D.—causing Teddi to scream and freak out in embarrassment.

And with that, Jeff Lewis and his co-hosts decided Matt Damon was the actor in question. And while Teddi laughed off the revelation, she admitted she's more concerned with fans not believing her.

"I've already been coined as a liar," she said, referencing some of her past RHOBH co-stars' accusations, "I don't need these kinds of things to be out and about."

See the epic moment in the video above.

SiriusXM's Jeff Lewis Live airs Monday through Friday at 12 p.m. ET on Radio Andy.

(E! and Bravo are both part of the NBCUniversal family)

Peacock is live now! Check out NBCU's streaming service here.