In the preview video for Keeping Up With The Kardashians, a voice-over says the upcoming episode is one of the most "unforgettable, outrageous, unbelievable Kardashians episode yet."

In the first teaser for episode 14, Bruce Jenner and Kris Jenner are having a meal with almost all of their siblings--Kourtney Kardashian, Khloe Kardashian, Rob Kardashian, Kendall Jenner, Kylie Jenner and Kourtney's boyfriend Scott Disick.

Khloe showed Kourtney a sexy picture of herself she had taken for her husband Lamar Odom. She told her older sister she took the pic to "spice things up a bit" for their marriage.

Bruce said he agreed with the idea, but it wasn't an appropriate conversation to have with Kendall and Kylie sitting at the table. He also told her to be careful with her sexy pictures, noting the possibility they could get leaked.

"Photos leaking, this and that. Look at the problems it has caused," he told Khloe in the clip, referring to his stepdaughter Kim Kardashian's sex tape that leaked in 2007. (Kim knowingly recorded herself being intimate in 2003 with then boyfriend Ray J, an actor and R& B singer. After it was leaked, she secretly struck a deal with adult video company Vivid and profited from sales of the tape. Several months later her family landed the KUWTK reality show deal with E!.) 

Kris then unashamedly blurted out to their children, "Bruce and I did a video."

When asked to be more specific, she announced, "Bruce and I made a sex tape."

After their children expressed shock at the reveal and had plenty of questions including, "What did you guys do in it?" and if there were "multiple positions" in the secret footage.

Bruce told the group that they deleted the video quickly after it was recorded. Disick then asked whose idea it was, and Kris confessed it was hers.

"We erased it immediately!" Bruce yelled while visibly embarrassed.

Later, Kourtney and Khloe think it's so funny that Bruce and Kris made a sex tape that the older sister decided to record a fake one with Disick. They decide to pretend to be Kris and Bruce making a sexy video.

"I feel like now I'm ready to recreate this amazing sex tape," Kourtney said in her confessional to the cameras.

Kourtney is seen wearing a cropped black wig and Scott is wearing a brown, bouffant wig as they pretend to be Kris and Bruce. Khloe is seen holding a video camera recording the action live as it happened.

Episode 14 of Keeping Up With The Kardashians season 8 will premiere on Sunday, Sept. 1at 9 p.m. EST/8 Central on E

Watch Kourtney and Scott pretend to be Kris and Bruce in the video below.