Happy Wednesday Hump Day -- also known as Celebrity Baby Bump Day! We rounded up the cutest pregnant celebrities of the week. Uma Thurman's baby bump has grown overnight! The actress showed off her pregnancy curves in a cute bathing suit while on vacation. We caught Sienna Miller having lunch -- and she is really starting to show! Also check out pregnant celebrities Kristin Cavallari, Molly Sims and Vanessa Lachey.
Bikini baby bump! Pregnant Uma Thurman was spotted having fun on a yacht in St. Barts wearing a black one-piece bathing suit paired with a sun hat. The 41-year-old actress is vacationing with her two kids with ex-husband Ethan Hawke, Maya and Levon.
The actress is expecting her third child with her boyfriend, financier Arpad Busson -- and it's reportedly a girl!
"She's happy and just a few months along right now," a source told Life & Style. "She's due in late summer.''
Many celebrities are ignoring their biological clocks and enjoying midlife motherhood.