David Beckham is no stranger to modeling in underwear -- but yesterday, the soccer stud did it mid-game!

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A bloody finger forced Beckham to change his shirt twice and strip to his skivvies once to switch his shorts during the Galaxy's match against FD Dallas on Sunday.

The stadium "went mad" when the sexy sports star/Armani model went down to his briefs, according to ESPN.

FYI -- The Galaxy won 2-1.