Just eight months ago, Kate Hudson gave birth to son Bingham and she's already showing off her post-baby body in a striped string bikini.

The mother of two didn't look a day over her age in "How to Lose a Guy in 10 Days" as she frolicked in the surf under the Cancun sun with longtime partner Matthew Bellamy. The pair were in Mexico for billionaire businessman Sir Philip Green's 60th birthday fete, but made the most of their Caribbean coordinates by extending their holiday to include some alone time.

It looks as if the pair managed to leave the kids with a babysitter as neither baby Bing nor 8-year-old Ryder (Hudson's child with rocker Chris Robinson) was spotted on the couple's romantic beach day.