3-4 days is about right if you can. Without putting you in machines and all kinds of needles and such it's an inexact science to know what your schedule should be. One tell I find accurate is your desire level. If you're bouncing off the walls and thinking about what to workout in what order all day, go. If you're dreading it and can barely get out of bed, don't.
As for routine, let me tell you, the girl with the butt you want does an inverse hack squat squat with 360 pounds. Trust me, I was creeping on her. Most girls make the mistake of going way too light. They squat 15lbs and then support their husband in bed giving them 15% of his body weight in that position, um, 79lbs.