Scarlett Johansson puts on a sizzling display in a strapless red dress as she joins co-star Chris Hemsworth

Scarlett Johansson put on a sizzling display in a strapless red maxi dress as she joined Australian hunk Chris Hemsworth at the London premiere of their new film Transformers One on Thursday.

Scarlett Johansson put on a sizzling display in a strapless red maxi dress as she joined  Chris Hemsworth at the London premiere of their new film Transformers One on Thursday

The Marvel actress, 39, looked nothing short of sensational as she stepped onto the red carpet at Cineworld Leicester Square in the ruched evening gown.

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Scarlett accessorised with a glitzy silver choker necklace and dainty hoop earrings, wearing her blonde tresses down in a straight style.

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The Hollywood star added inches to her height with black strappy heels and opted for a bold palette of a makeup, including a colourful lip and smoky eye.

Her co-star Chris, 41, looked dapper in an all-black tailored suit, complete with a silver chain and ring.

The Marvel actress, 39, looked nothing short of sensational as she stepped onto the red carpet at Cineworld Leicester Square in the ruched evening gown
In the movie, Chris provides the voice of Orion Pax, who later become Optimus Prime, the supreme commander of the Autobots.

Meanwhile, Scarlett steps into the role of Elita One – a devoted Autobot and powerful warrior.

The duo were joined on the red carpet by fellow cast members including Brian Tyree Henry, 42, who plays Megatron, and Keegan-Michael Key, 53, who voices Bumblebee.

She accessorised with a glitzy silver choker necklace and dainty hoop earrings, wearing her blonde tresses down in a straight style