Best fitness equipment for a rounder, shaped butt (PLEASE help!)?

I’m skinny and have NO muscles. So my butt is pretty flat. I don’t have time to go to a gym, I’m thinking about getting a machine to work out. Can anybody suggest a good machine? Does that Leg Magic works well for butts? (http://www.fitnessinfomercialreview.com/reviews/leg_magic)

P.S. Most machines that made for butt also make you have muscles on your legs. I don’t want it since my legs look great. My only problem is my flatty skinny butt

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