A fiancée is a woman engaged to be married. On the Muppet Show, Miss Piggy was Kermit's fiancée and covered him in kisses.
A fiancée is a woman engaged to be married; a man engaged to be married is a fiancé — two "e"s for a woman, one for a man — according to French spelling conventions. Fiancée, from mid-19th century French, means "a woman to whom one is betrothed" and is linked to the noun fiance, which refers to "a promise." In other words, a bride-to-be is promised to a groom-to-be, and vice versa.