Katie Maloney from Vanderpump Rules Reveals She Once Had Sex with Costar Kristen Doute's Boyfriend

Katie Maloney from Vanderpump Rules Reveals She Once Had Sex with Costar Kristen Doute's Boyfriend

Katie Maloney-Schwartz and Kristen Doute have something rather unusual in common.

During Monday’s after-show of Vanderpump Rules, Maloney revealed that before she married Tom Schwartz, she had a one-night stand with Brian Carter — aka her costar Kristen Doute’s current boyfriend.

“[It was] 2008, I was at a club with some friends — it was a birthday — and I met Carter… and then I slept with him,” Maloney, 32, admitted to Lisa Vanderpump and a giggling Brittany Cartwright, who had already known about the one-time hookup.

In response to the shocking revelation, Vanderpump was clearly taken aback and asked, “You slept with Carter!? Since you’ve been married?”

But the reality star quickly shut that idea down. “No! This was a billion years ago. This was like, two years before I met Tom,” she explained. “There was a lot of stuff in between this. I had a great single life!”

Defending her friend, Cartwright, 30, added, “Everybody has their old h— days back in [the day]!”

“Carter was literally like, one of my only one night stands,” Maloney said.

RELATED: Tom Sandoval Weighs In on Kristen Doute’s Relationship: ‘I Feel Like Kristen’s Come a Long Way’

The hookup made Doute, 36, think twice about dating Carter, whom she met on Bumble. Though hesitant at first, it was actually Stassi Schroeder who pushed Doute to give Carter a chance.

“I’m like, ‘Great, girl code. What do I do?’ and Stassi’s like, ‘She’s engaged, she banged him one time!'” Doute shared later on the after-show, adding that the first time the pair hung out with Maloney she was very “dismissive” of her new beau.

Kristen Doute and Brian Carter
Kristen Doute and Brian Carter

Once she began dating Schwartz, Maloney went on to explain that she crossed paths again with Carter, 34, at one of their favorite go-to spots, where he had begun working as a server.

“We’re at Hudson where we used to go at the time and Carter started working there as a server and Stassi said, ‘Oh my god, that guy’s really hot,’ and I was like… ‘I totally had sex with that guy, oh my god,'” Maloney said.

“Tom introduced me to him and I’m like, ‘I think we met before,'” she recalled, adding that later on, she told Schwartz, “I don’t know how good of friends you are with this guy, but I slept with him and that was it, and I don’t remember.”

RELATED: Vanderpump Rules‘ Tom Schwartz Says He Hasn’t ‘Messed It Up Yet’ with Wife Katie Maloney

<em>Vanderpump Rules</em> cast
Vanderpump Rules cast

Maloney and Schwartz tied the knot in August 2016 at the Twenty Mile House, a rustic wedding venue about eight hours north of Los Angeles, while Vanderpump, 58, officiated the ceremony.

“It was a fairytale wedding,” Maloney previously told PEOPLE.

“It was without a doubt the happiest day of my life,” added Schwartz. “This coming from a guy who’s pretty cynical about the institution of marriage. It feels cool just to say ‘my wife.'”

RELATED VIDEO: ‘Vanderpump Rules’ Cast Dishes On Katie & Tom’s Wedding Drama!

Despite cheating allegations that came to light last season on Vanderpump Rules, Schwartz recently told PEOPLE that the pair were doing very well, especially after marking their two-year wedding anniversary in August.

“I haven’t messed it up yet,” Schwartz said in November. “We’re still going strong. Everything is great, we’re more in love than we’ve ever been.”

Meanwhile, Carter and Doute have been dating since 2015.