Can You Guess Whose Sibling This Is?

Good looks must run in this family... This young woman's famous little brother is adorable, and she's a knockout! Can you figure out which celebrity crooner she's related to?

Although she is really close with her little brother, we can't imagine that his fame makes things a bit awkward for his big sis. He's one fifth of the world's biggest boy band right now, and with millions of girls lusting after her baby bro, we have a hunch she may get a bit annoyed or overprotective at times. But one girl she doesn't need to worry about (or totally does, we're not entirely sure...) is Taylor Swift, her brother's current squeeze who just so happens to be a sweetheart.

Have you figured out which floppy-haired dreamboat this gorgeous gal calls her brother? Click through below to find out!