Sorry, it's kind of a mess right now," Austin Mahone says as we walk beneath the skylights of his massive, white-marbled bathroom, past a koi pond filled with an assortment of plants and palm trees. I'm taking the first-ever tour of the singer's new home in the Miami area. He flips the light switch to a connecting room, illuminating racks of his signature colorful shoes. "This is my closet—it's pretty serious," he says, his green eyes fixed on the center shelf. "All my Giuseppes, some Gucci, and I have some custom-made pairs." Also: They're organized. "I categorize them by, um, how expensive they are," he says, smiling.