Inside Charlotte Casiraghi's wedding to Lebanese-French film producer Dimitri Rassam

The bride, who is the granddaughter of Grace Kelly, wore couture Giambattista Valli for the ceremony

Charlotte Casiraghi wore Giambattista Valli to marry Dimitri Rassam in the couple's second wedding ceremony. Instagram / Charlotte Casiraghi 

Sophie Turner and Joe Jonas weren't the only A-listers that tied the knot in the south of France this weekend.

Charlotte Casiraghi, daughter of Princess Caroline of Monaco and granddaughter of Grace Kelly, exchanged vows with her long-time beau, Dimitri Rassam, on Saturday.

Rassam is a Lebanese-French film producer, and son of late Lebanese film producer Jean-Pierre Rassam and French actress Carole Bouquet. Rassam splits his time between Paris and LA, and has produced many films, including 2015 animation The Little Prince.

The couple, who first married at a civil ceremony in Monaco last month, held a formal religious ceremony at the Abbaye Sainte-Marie de Pierredon, a chapel in Saint-Remy-de-Provence.

For the occasion, the published writer and entrepreneur wore a couture gown by Italian designer Giambattista Valli, which featured a sheer neckline and romantic ruffled tiers.

The bride paired the custom wedding dress with a sleek updo and billowing veil.

"Very happy to be part of their dream!" Valli wrote on Instagram.

Princess Caroline and Casiraghi's uncle, Prince Albert II of Monaco, were among the guests who attended the nuptials.

Casiraghi, 32, and Rassam became engaged last year.

The couple, who share son Balthazar Rassam, officially tied the knot on June 1 in a low-key ceremony, where Casiraghi wore a grey shift dress by Saint Laurent, adorned with oversized bows.

The bride, the eldest daughter of Princess Caroline, also changed into a strapless Chanel gown for a garden party. She teamed the dress with a diamond necklace once owned by her actress grandmother, who married Prince Rainier III in 1956.

The Cartier jewellery was gifted to Rear Window star Kelly by the royal on their wedding day, which was held at Monaco's royal palace.

This comparison photo shows Charlotte at her wedding this week alongside a photo of her mother, Princess Caroline, at her wedding to Philippe Junot in 1978. The couple divorced in 1980.