Brandi Glanville is holding nothing back about her son's sex life. The reality star opened up on Netflix's Calabasas Confidential about the moment she realized her eldest son Mason Cibrian, now 22, was no longer a virgin—and it was awkward.

"I remember realizing he wasn't a virgin when I walked by his room and I heard a spanking being given," Brandi recalled during the fourth episode of the Netflix series, which dropped May 29. She literally overheard the action happening behind closed doors.

The RHOBH alum was taken aback. "I was just like, 'F--k my life. My son is not a virgin anymore,'" she admitted to Mason and his friend Emilie Nelson. "I think he was 15 or 16. I was crying. I'm like, 'I am so uncomfortable right now.'"

But despite her initial reaction, Brandi actually approved of Mason's technique. "At least he's giving a spanking at least. He's got some moves," she added, unable to hide a smirk.

The conversation then turned to Mason's current girlfriend Sarah, whom Brandi adores. "I love her. She's the best. I want to keep her forever," the podcast host said. She's already planning their future—literally.

"I told her to get pregnant. I was like, 'Just trick him. Then we'll have a cute little Irish baby and I can just watch it,'" Brandi said. (She's kidding. Probably.)

Mason is equally smitten. "She's the only person I've ever been with where I can picture a future," he told his mom and Emilie. That's the kind of relationship approval even the most overprotective parent can support.

For Brandi, who shares Mason and younger son Jake, 19, with ex Eddie Cibrian, these candid moments with her kids matter. She has previously detailed the challenges of raising them as a single mom and is proud of how they've turned out. "They say please and thank you. They're so so sweet," she explained. "Every time they go to someone's house, the parents call me and like, 'Oh, Jake is the sweetest' or 'Your kids are so polite."