Vogue cover, Mary-Kate, Ashley Olsen

Craig McDean/Vogue

Love or hate their offbeat style, Mary-Kate and Ashley Olsen always turn heads when they hit the red carpet.

And that's why the child stars-turned-designing duo are Vogue's best-dressed ladies of 2011.

This year's list turned out to be a family affair, as the fashion bible didn't single out individual stars but rather stylish sisters!

So how far down the list—'cause you know they had to make the cut, right?!—were Kate Middleton (er, Duchess Catherine) and little sis Pippa Middleton?

Her Royal Hotnesses landed at No. 9. Not too shabby for Prince William's new wife, whose classic style was also given a shout-out recently by Vanity Fair and Harper's Bazaar U.K.

Other famous siblings making the cut include teen phenoms Elle and Dakota Fanning at No. 2, Beyoncé and Solange Knowles in the No. 7 spot, and actresses Kate and Rooney Mara rounding out the list at No. 10.

Do you think M.K. and Ash deserve the top spot? Weigh in below!

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