The 65-year-old, who'd been reluctant previously to go public in a bathing suit, took the plunge during a stay at a secluded luxury villa in Napa Valley.
'It felt very freeing,' Caitlyn said of her decision to throw caution to the wind and embrace her new body. 'I did see my reflection in the glass and I looked pretty good.'
Just before taking a dip, she'd been seen choosing between two bathing suits and deciding against a black one picked out for her by Kim Kardashian.
‘I love my daughter Kimberly to death but this is one that she would wear,’ she joked. ‘It is probably a little bit more revealing in the cleavage department.'
She settled instead on a white one-shoulder swimsuit.
‘Putting on a bathing suit represents a lot to me,' she explained. 'It is kind of scary because, you know, you are really exposing yourself. I am about as nervous as I can possibly be right now.'
Then she took a deep breath and walked out to join her friends in the pool.
‘OK. Are you ready?’ she asked as, with a flourish, she removed her diaphanous covering and showed herself off to positive cheers.