Since this game requires ladies to be familiar with the man they are paired up with it’s best played at co-ed “couples” showers where the ladies will be coming with their husbands or boyfriends.
Get all the guys at the party to roll up their pant legs till their knees are showing. Have the men sit in chairs in a row and blindfold the bride. The bride’s job is to feel the knees of each of the men and then guess which is her groom! After the bride takes a turn you can allow all the ladies to have their own turns to find their significant other, too (just make sure to have the men switch places around between turns).
This game is funny enough in it’s own right that a winner is not needed, but if you want to choose a winner you can play it round robin style with the ladies taking turns until they miss and the last one standing is the winner, or you can play it timed with the fastest correct guess getting the prize.
Be sure to note that you need to be sure that the bridal couple is absolutely ok with this game. If necessary, run the game by the bride and groom and get their “ok” before you play it. Since there will be a lot of friendly contact you don’t want anyone to get the wrong idea, and you certainly don’t want to be the cause of any arguments occurring later! Might even give them an excuse to practice at home before the party!