She was there to support her husband Justin Timberlake at the world premiere of his latest film Inside Llewyn Davis.
However, Jessica Biel ended up being the main attraction at the Cannes Film Festival screening of the movie thanks to her stunning outfit.
The American actress, 31, stood out from the usual red carpet styles in a mid-length Marchesa prom dress with feather underskirt and swirling applique detailing.
Supporting her man: Jessica Biel wore a striking Marchesa dress to support her husband Justin Timberlake at the Cannes Film Festival premiere of Inside Llewyn Davis
Working it: The Marchesa dress highlighted her tiny waist and slender calves
The creation from Marchesa's Fall 2012 collection showcased Jessica's tiny waist and slender calves as she posed solo outside the Palais des Festivals.
She completed her ensemble with a serpent necklace, a diamond-studded clutch bag and a pair of cream slingback heels.
With her husband Justin otherwise engaged doing group shots with his co-stars, Jessica posed up a storm for the world's paparazzi.
Part of the fashion flock: Jessica's hemline appeared to be made of white feathers
A lot of bling: Jessica wore a serpent necklace and a diamond-studded clutch bag
Ahead of her premiere appearance, she tweeted her enthusiasm for France.
She wrote: 'The French do everything right. Except for maybe punctuality, but that's more of a German thing anyway. #Cannes #vivelafrance.'
The event was the world premiere of Inside Llewyn Davis, with the movie's stars Oscar Isaac, Carey Mulligan and Garrett Hedlund and directors Joel and Ethan Coen in attendance.
Standing out: Jessica's unusual dress and serpent necklace was striking in contrast to the more traditional gowns on show
Busy night: Jessica shared the red carpet with a host of A-listers
Also bringing the glamour besides Carey and Jessica were Jane Fonda, Aishwarya Rai, Kirsten Dunst and Nicole Kidman.
Inside Llewyn Davis is set in the world of folk music in New York in the early 1960s.
It's directed by Joel and Ethan Coen and has emerged as the front-runner to win major prizes from the Cannes jury led by Steven Spielberg.
Inside Llewyn Davis is due for release in the US in December 2013.
So proud of you honey: Jessica and Justin leave the Palais after the screening
That's my man! Jessica was there to support husband Justin Timberlake, who joined his co-star Carey Mulligan on the red carpet
Here come the L'Oreal girls: Indian actress Aishwarya Rai in Elie Saab couture (left) and Jane Fonda in hot pink
Big night: Justin and Carey were joined by (L-R) Garrett Hedlund, director Joel Coen, Oscar Isaac director Ethan Coen, John Goodman and musician T-Bone Burnett