Bruce Jenner and Kris Jenner Bruce Jenner and Kris Jenner

File this one under TMI.

It turns out Kim Kardashian isn't the only member of her family to have made a sex tape. Her mom, Kris Jenner, reveals that she and Bruce Jenner once made the very same kind of tape in a sneak peek from Sunday's episode of Keeping Up with the Kardashians.

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The Kardashian children, including 17-year-old Kendall, are horrified to learn of their parents' tape, but of course they also have some burning questions. So whose idea was it to make the tape? And if that doesn't whet your appetite enough, watch a second clip from E! reality show, in which Kourtney Kardashian and partner Scott Disick put on some wigs and bust out the ol' video camera to re-enact Kris and Bruce's magical moments on screen.

Keeping Up with the Kardashians