The other day Kim Kardashian posted an adorable shot of her daughter North (and niece Penelope) dressed up as mermaids at the pool in St. Barth, and the famous tykes were joined by a woman dressed up as a mermaid.

Of course, Britney Spears doesn't see a point in hiring a entertainer for her sons Sean Preston and Jayden James -- she busted out her very own mermaid suit at the pool! Brit is currently in Las Vegas for leg nine of her residency at The Axis at Planet Hollywood, and after nine shows over the next two weeks, she'll have a month off.

Her contract expires on December 31, and she recently told E! News that's she's NOT sure if she'll renew it! "I haven't made up my mind," she said. "I really love doing the show. It's a lot, a lot of fun but I'm kind of torn right now. I don't really know what I want to do." We have a feeling this could just be a bid to get more money -- after all, Brit's raking in a fortune for the shows, so why would she want to give that up?

Oh, and speaking of giving things up ... remember Brit's previous life as Justin Timberlake's girlfriend? Alyssa Milano, who also dated Timberlake, posted this throwback pic yesterday of the trio, with pal Alaa Khaled. Awww! We long for the day when JT and BritBrit were the reigning king and queen of pop!