Back in 2015, Kylie promised us that she wouldn`t be pursuing a music career. And, for a while, she stuck to that promise, focusing on lip kits and Instagram. But then rapper Lil Yachty released a song called "Beautiful Day" with producer Burberry Perry... featuring none other than the youngest Jenner / Kardashian Kash Kow. Kylie rapped her own version of the the Mr. Rogers` Neighborhood theme song. Your childhood is officially over.