Sisters are super in right now. Just ask Mary-Kate and Ashley Olsen, or Elle and Dakota Fanning. On the other side of the pond, the sister duo to watch is the Geldof girls, Peaches and Pixie. Daughters of Sir Bob Geldof, lead singer of The Boomtown Rats and writer of the iconic, philanthropic all-star choir song "Do They Know It's Christmas?" (one of the best-selling singles of all time, no bigs). Peaches and Pixie are fixtures on the London fashion scene, besties with Alexa Chung and Kelly Osbourne, and style icons in their own right. Peaches is a little more preppy and posh while Pixie is a little more rough and rock n' roll, but they both buck trends for a look that is both unique and inspiring.

Click through the gallery to see some of the Geldof girls' best looks, and comment on your favorites!