How often should I do cardio if I want to build muscle?

I'm already slim and I should let you know I'm a girl. I've started doing 50 squats a day and I have been doing one cardio session, 2 toning sessions (with weights) and 1 yoga session a week. I want to focus mainly on my butt though. I dream of having a bum like Candice Swanepoel and although it has already improved so much I feel like it just needs more muscle around that area. I'm already firm everywhere else but does anyone have any suggestions about how to make this area gain more muscle and should I quit the weekly cardio session for a while and just focus on the butt?



P.S. I'm going on a long beach holiday next year

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