It's safe to say that Taylor Swift [1] and her squad had a blast in Hawaii. The singer took to Instagram last Friday to share a series of snaps from her Maui trip with Haim's Este, Danielle, and Alana. In one picture, she's rocking a bikini alongside her friends — despite the fact that a few months ago, Taylor explained why she doesn't show her belly button [2], joking, "I don't want people to know if I have one or not. I want that to be a mystery. As far as anyone knows based on my public appearances, they haven't seen evidence of a belly button." She also posted a picture of herself wearing a one-piece bikini, giving a hilarious nod to SNL's Swiftamine sketch [3] with the caption "She's always wearing, like, a 1950s bathing suit." Well played, Taylor. Check out pictures of the group's island getaway, and then see more of the best celebrity bikini snaps [4]!