One source of drama in this week's Season 4 premiere of Real Housewives of Beverly Hills was the ladies' discussion of a nude scene that Lisa Vanderpump supposedly filmed years ago. So what was this all about?

In the episode, Kyle Richards jokes around at her party about a sexy scene that Lisa supposedly filmed in which part of her nipple was exposed. Kyle claims that Lisa supposedly showed off three-fourths of the said nipple.

Is this true? Indeed, Lisa did show her bare breast briefly in a B-movie that she was in many, many years ago. The film in question is a British horror flick from 1978 called Killer's Moon, and according to IMDb, it's about four escaped mental patients finding a "busload of stranded schoolgirls." And yes, Lisa played one of the aforementioned schoolgirls.

The scene in question involves Lisa — who was 18 at the time — lying on a table with her blouse unbuttoned and her left breast exposed as she is attacked by one of the inmates.

To see a video still of Lisa with her breast exposed, click here!

This was reportedly only Lisa's third acting gig, and she didn't do many more before retiring gracefully from life as a thespian. She did nab a few roles in the '90s, with her final acting gig being an appearance on the 1995 TV drama Baywatch Nights. In other words: Yes, Lisa got to star on a show with The Hof.

So there you have it: Lisa's boob has indeed made its screen debut. However, Kyle should certainly know that struggling actors sometimes have to take on projects they're not proud of. After all, when Kyle was much younger, she appeared in the 1977 James Brolin film The Car, about a car that goes on a murderous rampage. Yes, that's it's actual premise. We're guessing it makes Transformers seem like high art. 

Long story short: Lisa seems capable of laughing about Killer's Moon now, but we're hoping that none of the ladies feel the need to bring it up again. Also, we're glad Kyle and Lisa found careers in reality TV, meaning neither of them ever had to contemplate starring in anything called, say, The Car 2: Full Bleed Ahead.m

Sources: Daily MailIMDb