Helen Mirren debuts blue hair look on opening day of Cannes

Dame Helen Mirren stunned crowds at the Cannes Film Festival by debuting a shock of bright blue hair.

Dame Helen wore her hair in a messy up-do highlighted with varying shades of blue and turquoise.

The actress also carried with a black fan with #WorthIt written on it in a nod to her partnership with L’Oreal Paris.

Dame Helen’s eye-catching hair colour was not her first at the international film festival.

She previously told US outlet People magazine that she had been inspired to make the changes after watching reality TV.

“I was watching an episode of America’s Next Top Model and there was this little English girl on it,” she said.

“She had bright pink hair and she looked so great.”