"last christmas" song?

a few years back i heard a version of the song "last christmas" but it was by a girl group, does anyone know what group it could've been? i'm aware that alot of people have covered the song but i don't even know of a single girl group so any answers with girl groups who covered it are appreciated cause i'm clueless as of now ^_^ all i've found are ashley tisdale and hillary duff -_-