Mel B claims she slept with Geri Halliwell back in the day.

The Spice Girls singer made the shocking revelation during an interview on Piers Morgan’s Life Stories after host Piers Morgan straight-up asked her if she and Geri—aka Ginger Spice—ever hooked up in the '90s.

At first, Mel was a little reluctant to confirm the longstanding rumors, telling Piers, "Yeah, we all slept in a bed together but not 'like that' all of us." So, Piers rephrased the question, asking, "Did you sleep with Geri 'like that'?" to which Scary Spice nodded and smiled before she eventually admitted they did, in fact, have sex once.

"She's going to hate me for this because she's all posh in her country house and her husband. But it's a fact. It just happened and we just giggled at it and that was it," she said. "It was just that once and hopefully when Geri gets asked that, which hopefully she will after this, she won't deny it. Because it was just a fun thing."

"We were best friends. It just happened," she added, noting that Geri has "great boobs."

Meanwhile, Mel C—aka Sporty Spice—was in the audience during Mel B's interview and claims she had absolutely no idea her bandmates had hooked up. “This is all news to me,” she said.

Check out a clip of Mel's interview in the video below:

In case you didn't know, back in 2003, Geri revealed she had sex with a woman once during an interview with Howard Stern—and now, we finally know who it was with. “I had lesbian sex once," she said at the time. "I realized quickly I was not a lesbian. I don’t mind boobs but the other bit is not my cup of tea. I didn’t like the lesbian thing. It is part of experimenting. I was drunk at the time. I could never ever say who it was."

Geri has yet to comment on Mel's bombshell revelation, but the Spice Girls are set to go on a 13 date tour in May 2019, so this story is bound to come up again.

More From 99.9 KTDY