Uma Thurman, 44, Wows in Red Bikini

The 44-year-old actress and mother of three showed off her svelte bod in a bikini Sunday while vacationing in St. Barts. The ageless Kill Bill star showcased her long legs, toned tummy and sexy cleavage in a tiny, red two-piece, but it was her makeup-free face that highlighted her best feature: Her smile! If you'll notice, though, Uma rarely flashes her pearly whites on the red carpet. Reason being? Someone told her she had an ugly smile when she was a kid!