Red Carpet Arrivals

Jason Merritt/Getty

Hayden Panettiere

Heroes star Hayden Panettiere looked all grown-up in an organza one-shoulder gown from J. Mendel, paired with 19th-century diamonds from Fred Leighton and a Judith Leiber clutch.

Quick Links:

More Photo Galleries

Most Popular on InStyle.com

Please Note: You may have disabled JavaScript and/or CSS. Although this news content will be accessible, certain functionality is unavailable.

Skip to news content.

Cannes Film Festival Fashion Update: Heidi Klum, Nicole Kidman, and More More

Crafty Summer Cocktails Plus a Summer Spotify Playlist! More

Pick Your Top Five Favorite Looks from Cannes in This Week’s A-List! More

Green Market All-Star Recipes More

The Bachelorette Returns! The Show’s Stylist on What to Expect from Desiree Hartsock This Season More

Poll: Who Is the Fashion Queen of the Cannes Film Festival? More

Memorial Day Bikini Prep: Your Best Hair Removal Options More

InStyle Reader of the Week: Style Blogger Pip Addis of Indiana, Pa. More

See the Most Beautiful Red Carpet of Cannes: amfAR Cinema Against Aids Gala More

Memorial Day Weekend Ogling: The Sexiest Abs of Hollywood More

Emmy Awards 2009

Hayden Panettiere

Quick Links:

More Photo Galleries

Most Popular on InStyle.com

Red Carpet Arrivals

Look of the Day

Olivia Palermo

TRENDS THIS SEASON

Sites We Love