Kris Jenner was in the dog house after meeting up with ex-flame Todd Waterman -- so to prove her love for husband Bruce Jenner, she did what any reality TV star would do: She took a polygraph.
Last night's episode of "Keeping Up with the Kardashians" started with Kris going out with Todd Waterman, the man she cheated on ex-husband Rob Kardashian with before their 1990 divorce, behind Bruce's back.
When Kris revealed she met up with Todd, Bruce was furious -- prompting Kourtney to devise the lie detector test plan.
When hooked up to the machine Jenner revealed some interesting tidbits -- saying which of her daughters is her favorite, confirming who Khloe's actual father is and, finally, her real feelings about Todd.
Watch the clip above.
While Bruce wasn't too pleased with what he saw, the expert administering the test said any needle spike to the Waterman question was likely due to an emotional reaction to a past memory ... and not from a lie.
In case you were wondering: Bruce forgave Kris by the end of the episode.