The 65-year-old "I Am Cait" star - previously known as Bruce Jenner before undergoing a gender transition - was initially worried and nervous about exposing herself in swimwear, but now she has done it she felt she looked "pretty good", reported E! Online.
"It's kind of scary because, you know, you're exposing yourself. I'm about as nervous as can possibly be right now," Caitlyn said.
However, once she was in the pool with the support of her friends - who were cheering her on - Caitlyn soon became confident and described the whole experience as "freeing".