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

HILARY & HAYLIE

When it comes to Hilary and Haylie Duff, no sibling pair can compare. The sisters have not only collaborated with each other on the big screen (Never forget Material Girls!), but the stars have also been remained super-supportive of each other through the years, whether it's attending events in one's honor, giving shout-outs on Instagram or launching their joint campaign to combat mom-on-mom bullying.