Amber Heard definitely looked the part as she came dressed in a stunning emerald green mermaid gown and cap at the Aquaman premiere.

The US actress plays Mera in the superhero movie, a princess from the fictional underwater kingdom of Atlantis.

Game Of Thrones star Jason Momoa plays Aquaman.

At the film’s premiere in London on Monday, Amber, 32, defied the cold weather and wore a marine-inspired costume for the occasion.

Her flowing, seaweed-green dress featured a plunging neckline, while the look was capped off with matching headwear and gold heels.

Meanwhile, hunky Jason, 39, reveals he had to have “two stunt doubles constantly working” on set because of the elaborate action sequences.

The muscle man plays the aquatic superhero, also known as Arthur Curry, in the James Wan-directed flick and said: “I definitely do a lot of my stunts but there’s so many stunts in this that we had to constantly be prepping so I had two stunt doubles constantly working.”

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