Hailey Baldwin looked red hot in a Baywatch-inspired backless swimsuit poolside at W South Beach in Miami on Sunday.The 19-year-old IMG model paired her one-piece with a gold choker and necklace as well as a messy fringed top-bun.The 5ft9in blonde was surely beating Florida's 85F-degree heat by joining a bevy of scantily-clad girlfriends for her refreshing, chlorinated dip.