HARPER'S BAZAAR: Kylie Jenner rocks a neon pink string bikini Coming Soon SIZE To celebrate her 23rd birthday, Kylie Jenner took a trip to Turks and Caicos with her sisters, Khloé Kardashian and Kendall Jenner. Having hit the beach in a skimpy pink bikini, Kylie changed into a neon string bikini later in the day.