Sienna Miller has turned Can-Can dancer.

The fun-loving actress kicked up her heels at the festival award ceremony on Saturday night, and led the other jury members in a rendition of Thank You For the Music by ABBA.

The panel, including Nick Moran, Elsa Zylberstein, Sylvie Pialat and Pascal Elbe, looked to be having a ball as they formed a line to do the Can-Can and sing along on stage in front of the audience.

Thank you for the music: Sienna Miller dances to Abba on stage with fellow jury members Pascal Elbe and Sylvie Pialat at the 21st Dinard British Film Festival

Fun-filled: The jury celebrated the awards ceremony of the film festival in Dinard, France

Dressed in a colourful sheer dress and Christian Louboutin black heels, the 28-year-old turned serious to attend to her role as judge of the six British films presenting at the festival.

This year's competition includes Skeleton, Soulboy, Sex, Drugs & Rock 'N' Roll, Treacle Jnr, We Want Sex and Mr Nice, starring Sienna's ex Rhys Ifans.

The stylish star has used the film festival as an opportunity to model clothes from Twenty8Twelve's Spring 2011 Collection, which she and sister Savannah debuted at London Fashion Week in September.

Judge: The actress was part of the panel observing British films Skeleton, Soulboy, We Want Sex, Treacle Jnr, Sex, Drugs & Rock 'N' Roll and Mr Nice, starring her ex Rhys Ifans

Her shimmering dress revealed a little too much on the red carpet under the photographers' flashbulbs, showing up the actress' skin-coloured underwear.

Sienna will go from judging duties to hosting duties this week as she flies to Los Angeles to open Esquire House on Friday night.

The 'ultimate bachelor pad', created by Esquire magazine, is a 9,000-square-foot luxury mansion in the Hollywood Hills that is annually rebuilt and outfitted by a team of top designers.

We see right through you: Sienna dazzled in this sheer dress on the red carpet, but harsh flashbulbs revealed her skin-coloured underwear

The $18.9 million house hosts charity and celebrity events and opening night will benefit the International Medical Corps (IMC).

Sienna is the Global Ambassador for IMC, which is 'dedicated to saving lives and relieving suffering through health care training and relief and development programs.'

Double duty: The stylish star has used the film festival to showcase Twenty8Twelve's Spring 2011 collection