You know the saying: What happens in Vegas stays in Vegas. We won't lie, though—if former Playboy model Holly Madison gave us a tour of Las Vegas, we'd definitely have to take some pictures for posterity's sake. Unfortunately for us (and fortunately for her), a personal, in the flesh tour with Holly of Sin City isn't in the cards, but we've got the next best thing. This Sunday at 10:30 pm, her new reality show, Holly's World, premieres on E!, and as a special treat, she gave us the inside scoop on her fave Vegas hangouts. Cue the slot machine sound effect: dingdingdingdingding!