Which is the only girl group to have a best-selling album of the year in the U.S.?

Girl groups aren't just about matching outfits and synchronized dance moves – they're cultural powerhouses. These ladies have been dominating the airwaves decades with killer harmonies and attitude to spare.

The Ronettes' beehives and "Be My Baby" still make hearts flutter, while Sister Sledge turned family reunions into disco infernos. The Go-Go's shredded stereotypes along with their guitars, proving they could rock the charts while rocking out. En Vogue's vocal acrobatics made us all think we could sing (spoiler: we couldn't), and SWV had us "Weak" in the knees but strong on the Billboard rankings.

These groups made music, history, and millions of fans grab their hairbrushes for bedroom lip-sync battles. They've given us unforgettable anthems and showed us that friendship never ends – except when there's a lucrative solo career on the horizon.

Despite all their success and hundreds of albums released, only one girl group has ever claimed the title of best-selling album of the year in the U.S. Can you guess which powerhouse girl group sat at the top of the charts?