Singer Demi Lovato sported a risqué Black Nasty Gal raya bondage bra for a Z-100 pool side bash in New York City last night. She styled the sexy $60 topper with high-waisted cutoff shorts and thigh-high mesh boots, completing the look with slicked back tresses and bubblegum lips. For a pool party held in honor of her latest hit—which is currently ruling iTunes as the number one single—this look made sense, minus the heels. But as a red carpet outfit, the ensemble felt a bit informal. But hey, it’s her party, and she can wear what she wants to!