Kardashian, who has spoken about her love of diaper changing in the past, admitted to Kimmel that daughter North, 13 months, had become a less willing participant lately. "She does not want to sit to get her diaper changed," the 33-year-old reality TV star shared.
But it didn't mean the diaper-changing pro was any less eager to take on new dad Kimmel, who welcomed baby Jane in July, in the quest to be crowned the ultimate winner.
In the funny sketch, Kimmel explained the rules to Kardashian: you have to un-pop the onesie, wipe the baby ("Is it back to front or front to back....whichever way it goes!" said novice Kimmel, laughing), put on a new diaper and move onto the next baby.
"I usually take my ring off," says Kim, removing her enormous engagement rock and placing it on changing table.
"It's worth more than Versailles," quipped Kimmel.
As the clock started, the pair competed for the prestigious prize: a diapered Oscar statue.
Watch the hilarious video above and see what happens when the crying babies start to pee!