The group have treated their Directioners to a six-minute long music video co-written by comedian James Corden and have proved that they are rather impressive actors as well as chart-topping singers.
Ditching their cool boy band image, each of the guys take on characters that are a little out of their comfort zone - particularly Zayn Malik who is seen dressed up as a sexy female secretary, complete with a pencil skirt!
The visual begins with Louis Tomlinson and Niall Horan starring as loud mouthed studio executives discussing One Direction's foray into the film industry with their upcoming 3D film, This Is Us.
The two men are then joined by the band (playing themselves at this point) and fire ideas at the boys about how they can make This Is Us a smash in the box office by utilising 'Marcel the Marketing Guy' (played by Harry Styles) and 'Leeroy the Choreographer' (played by Liam Payne).
Both Harry and Liam put on great performances as their respective characters, with Harry swapping his suave reputation as a ladies' man for a geeky makeover.
The video - which also includes footage from their This Is Us film - ends with the group busting some cheesy moves as part of a rehearsed dance routine with the rest of the office workers.
One Direction have been teasing fans with snippets and pictures from the visual last week in the run up to its release and now we've seen the final version, we have to admit that it was worth the wait!
Watch the 'Best Song Ever' official video and let us know what you think in the comment box below, as the best comment from across the website each week wins £50!