Yet another 40-something starlet is baring (nearly) all in a bikini.

Joining the likes of bikini babes Heather Graham and Halle Berry, 40-year-old Uma Thurman made a splash in a dove-gray low-cut halter two-piece while yachting off the island of Filicudi.

Flashing a long, lean, and tanned body with a few curves here and there (hey, the woman's had two kids), the actress -- who recently teamed up with The Body Shop to end sex trafficking -- looked fit and fabulous as she did a swan-dive off the yacht.

But how does the "Kill Bill" star rate against other Hollywood bathing beauties? Check out our gallery of stars in their bikinis below.

And tell us -- is Uma still foxy at 40?

In other swimwear news, older women are flocking to the "grankini" trend.