01/18/2011 01:08 pm ET Updated Dec 06, 2017

Kate Beckinsale In A Bikini (VIDEO)

Kate Beckinsale showed off blonde hair and a toned bikini body in Mexico with her husband, Len Wiseman, over the weekend.

Kate, 37, starts filming 'Underworld 4' in March so she might have to go back to brunette. What do you think of her new hair color?