Keira Knightley and her rocker fiancé James Righton are expected to get hitched in a private ceremony near Nice this weekend.
The Jack Reacher actress and Klaxons' keyboardist are planning to tie the knot in an intimate event in front of 100 close friends and family members.
A source told The Daily Mirror: "It's all been a massively covert operation - her friends and family were only told recently about the ceremony.
"They've all been told not to travel in big groups, to arrive separately and to all spread out where they're staying so as not to draw attention to the wedding party."
The couple got engaged in May 2012 after meeting through mutual pal Alexa Chung, and recently moved into a new home in East London together.
The 28-year-old actress - who previously dated her Pride & Prejudice co-star Rupert Friend for five years - recently said they were in no rush to get married, hinting they would have a low-key ceremony when the time came.
She joked: "I could have six fake weddings. God, that would be expensive. We're not big-wedding types. I don't need to have all that.
"I'm just trying to enjoy the engagement bit. My parents are together after 40 years. The fights are there, but they love each other.
"It's not like the first three months, the first two years, whatever it is, but I think it gets more interesting, or I hope so."
Knightley - who is the face of Chanel's Coco Mademoiselle fragrance - is rumoured to be wearing a custom-made Chanel dress made by creative director Karl Lagerfeld himself.