Brandi Glanville shared that she found out her and ex-husband Eddie Cibrian’s son Mason lost his virginity after passing by his bedroom door.

“I remember realizing he wasn’t a virgin when I walked by his room and I heard a spanking being given,” the podcaster recalled on Netflix’s “Calabasas Confidential,” which dropped on Friday.

Glanville — who made a cameo on the new reality show’s fourth episode — told her son’s friend Emilie Nelson, “I was just like, ‘F–k my life. My son is not a virgin anymore.’”

The “RHOBH” alum added that Mason, now 22, was around 15 or 16 years old at the time.

Brandi Glanville shared that she realized her and ex-husband Eddie Cibrian’s son Mason (pictured here with his mom and brother Jake) was no longer a virgin “when I walked by his room and I heard a spanking being given.”

“I was just like, ‘F–k my life. My son is not a virgin anymore,’” the mom of two recalled about her eldest (pictured here in a selfie).

“I was crying,” Glanville confessed.…