Antonio Cromartie was TRIPLE TEAMED in Vegas this weekend ... by 3 little people who grinded their junk all over his leg ... and TMZ Sports has the video.

The AZ Cardinals ball hawk celebrated his big 30th birthday with his wife and a bunch of friends at Beacher's Madhouse at the MGM Grand -- where the NFL star was pulled on stage for a little personal attention from one of the show's big stars.