The youngest sister of the Kardashian-Jenner clan and the world’s youngest billionaire just celebrated her 22nd Birthday on a $250 million yacht in Italy. Despite recent marriage rumours going around when Kylie boarded her private jet, her choice of attire for her birthday celebrations just sparked some more thoughts of whether she’ll be tying the knot soon. Kylie kicked off her festivities with the release of a new Birthday Collection from her billionaire dollar company Kyli