Forget the older Kardashian sisters. The littlest of the brood is where the comedy's at. Kylie Jenner is a 10-year-old spitfire who minces no words and speaks full-steam ahead. Menstruation? Oh yeah, she may not know the dirty deets, but she can give you a succinct, single-sentence explanation of it that's dirty enough to suffice. The only question is: Why would big sis need a pair of panties to demonstrate how to use a tampon? Oh, forget I asked.