Sienna Miller's new look was inspired by Grace Kelly.

The 33-year-old star has been channelling the late beauty icon on the red carpet at this year's Cannes Film Festival by wearing her pretty blonde bob in gentle face-framing waves.

He hair stylist, Earl Simms, told Grazia Daily: ''For the opening ceremony it seemed fitting to take our inspiration from Grace Kelly - chic and elegant.

''First, I prepped her hair with Clynol Moisture Dream Leave In Conditioner and Windle & Moodie Foundation Spray. I blow dried her hair with a large round brush, then tonged with medium curling iron in large sections. I left it to set, then took them out and brushed them through. I blow dried with a large round brush to soften the curls and gently smooth the hair, without taking away the body and bounce.''

However the 'American Sniper' has clearly enjoyed switching up her look at the annual festival held in the south of France.

After sporting the Old Hollywood-style bob, which she teamed with an off-the-shoulder grey dress, the blonde beauty donned gothic braids with a high-collared, star-patterned, voluminous black gown to attend the premiere of 'Carol'.

Earl said of her quirky plaits: ''Sienna's hair had been pre-texturised with a gentle wave - this will give a better hold for the plaits on shorter length hair like Sienna's. [I created] two inverted plaits from the centre of the front of the head, moving around to the nape of the neck.''