World's Most Beautiful

9 Celebrity Sisters You've Most Likely Fallen in Love with Through the Years

In honor of PEOPLE's World's Most Beautiful issue, we're rounding up the buzziest, most successful siblings around

KATE & PIPPA

Keeping up with Kate and Pippa Middleton! All eyes were on the youngest Middleton sister long before Princess Kate wed Prince William in 2011, launching the Middleton family into the global spotlight. Aside from the obvious (ahem, Kate is the Duchess of Cambridge, after all), the world's fascination with the sisters can be credited to the pair's intelligence and eloquence, flawless genes and effortless, totally on-point fashion sense.