You, too, can have an ass like that. Squats and lunges will get that booty popping before you know it. Or if a squat rack isn't feasible, booty bands are also really effective. I rely on those when I don't have access to a rack.
And then make sure to get your protein for your growing booty. Vanilla or strawberry flavored whey protein in whole milk is fucking delicious. With how good that tastes, there's no reason you can't get enough nutrients.

Hopefully this helps! Everyone deserves a juicy ass.