Sizing Up the Love Match Between Mom-to-Be Hayden and Her Towering Fiancé

The parents-to-be's romance can be measured – we know, because we broke out our rulers

CHEERS TO THAT

Their height difference: About 2 steins of beer
Dating on and off since 2010, the 5-foot-2-inch Nashville star and the 6-foot-6½-inch Ukrainian boxing champ have never let their sizable vertical challenges interfere with their fun, including a September 2010 Oktoberfest celebration.