How did Kylie Jenner get a butt like this? (Photo)

Have you ever considered the possibility of photoshop, thousands of Instagrammers out there use it every day and on every photo to enhance, slim, and/or tuck their physiques. Another possibility is injectables, all which are fraught with disasterous complications in the future. Glad to help. 

Hello dear!!
Thanks for the question and provided information as well.
In short, it looks like butt augmentation with implants and contouring with fat transfer. l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)