The pop star's makeover was revealed on the One Direction Twitter account earlier today (18 July) and shows 19-year-old Harry as a dowdy looking adult in an office, dressed up in a sleeveless cardigan, a brown tie and a pair of geeky glasses.
Oh, and he's even sporting some boring brown shoes that look like they've been borrowed from his grandad!
In the shot, Harry's character appears to be celebrating something, as he throws his office documents into the air and busts a little move for the cameras.
The One Direction boys have each received a drastic makeover for their latest visual and their various roles are being unveiled every day this week before the final product is released on 23 July.
Yesterday (17 July), Liam Payne was seen sporting a blonde wig on set, while Niall Horan might have had the biggest transformation of all, as he was turned into a middle-aged studio executive - complete with a receding hairline and a greying beard!
Louis Tomlinson and Zayn Malik's characters are yet to be revealed, but after seeing how crazy Harry, Liam and Niall look, we can't wait to see what else the video directors have in store!
'Best Song Ever' will feature on One DIrection's forthcoming third album and the track will also be heard in the boys' highly anticipated 3D documentary film, This Is Us, which hits UK cinemas on 29 August.
Listen to a preview of 'Best Song Ever' in the trailer below.
Which makeover do you like the best so far? Let us know in the box below, as the best comment from across the website each week wins £50!