By Amy Lawrenson

Last night the cast from the new film Avengers Assemble assembled on the red carpet in London for the premiere. In the movie Scarlett Johansson flaunts a bright copper bob to reprise her role of Natasha Romanoff aka Black Widow. Despite her character working with the other super human characters to save the earth her copper tresses always look so coiffed (how she finds the time, we'll never know), and Scarlett's hair at last night's premiere was just as groomed as her character's.

In place of the copper-hued bob was a halo braid just like the ones we've seen at shows like Erdem and Valentino in recent years. She paired the elegant up-do with a strapless black, red and navy floral Prada dress. Stunning. Now, while we can't all afford a designer gown, we can all get practicising and work a plaited up-do just like Scar-Jo's. Marc Trinder, Creative Manager at Charles Worthington Salons and the mastermind behind the ‘halo braid’ shares his step-by-step guide with you here...

See Scarlett Johansson's Style File here...