Credit: Isla/Splash News Online

Jessica Biel has some brand-new bling!

She accepted beau of four years Justin Timberlake's marriage proposal in December, and on Friday, the actress showed off a new gold accessory on her left hand ring finger -- but sadly it's just a prop.

Currently filming Emmanuel and the Truth About Fishes in Los Angles, Biel, 29, was all smiles as she flashed the gold band, which is part of her new look in the thriller, costarring Alfred Molina.

She may not be ready to show off her new sparkler from Timberlake, but the actress sure has had bridal couture on the brain.

In mid-January, she stepped out at the Golden Globe Awards in a white lace long-sleeve gown by Elie Saab, accessorized with a diamond necklace, Tiffany & Co earrings and Christian Louboutin heels.

Timberlake popped the question to Biel atop a mountain in Jackson, Wyoming in late December. "He's never been happier and knew it was the right time to propose," a pal tells Us Weekly.