It's David Beckham's birthday, but it's Victoria's followers who are getting a present on Tuesday ... 'cause the soccer superstar's wife just shared a thirst trap of the 48-year-old in his undies for the occasion!!
Victoria posted the sexy snap just now ... showing David rocking nothing but some white Calvin Klein briefs and a beanie as he takes a dip in some water -- and something tells us it was cold outside.
The pic already garnered more than 229,000 likes on social media .