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Uma Thurman

Spread/X17online.com

Kill Bill star Uma Thurman was definitely, well, killin' it on Saturday as the actress showed off her burgeoning belly while vacationing in St. Barts.

After spending part of the day on a yacht, the pregnant actress later slipped into a black two-piece to enjoy a little sand and surf with her 13-year-old daughter, Maya, as seen in pics obtained by X17.

This isn't the first time the 41-year-old soon-to-be mother-of-three (she and ex Ethan Hawke also have a 10-year-old son, Levon) flaunted her beautiful baby bump.

Thurman, who's expecting her third child—and first with boyfriend Arpad Busson—was recently spotted on the streets of New York City, albeit a bit more clothed but no less spectacular.