The 45-year-old star was costumed as the late actress-turned-princess Grace Kelly in the colourful design as she arrived to film her scenes in Menton, France.
Stylists had accessorised the Oscar winner's look with a large hat, long white gloves and flat shoes, reported Daily Mail.
They styled Kidman's cropped blonde hair in loose curls which were tucked under the hat. The superstar was spotted carrying a basket of bread during her scenes as she walked across a bridge.
The crew also filmed her on a sprawling yacht that had been docked in Nice, France a day earlier.
Last week the actress was spotted shooting in Monaco as she plays Kelly who was considered one of the most beautiful and stylish women in the world.
She has been making every effort to emulate the regal Princess of Monaco, and was even pictured riding a horse during a shoot last week.
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The biopic tells the story of the Philadelphia-born star, who made it big in Hollywood before she married Price Rainier of Monaco at a fairy-tale wedding in 1956.
Helmed by 'La Vie en Rose' director Olivier Dahn, and with a reported USD 30million budget, the film co-stars Tim Roth, Parker Posey, and Milo Ventimiglia.
"Grace of Monaco" is scheduled for release some time in 2014.