The group garnered over 56.3 million votes to top the social media-driven music poll, with the results revealed in a live top 20 special, reported Digital Spy.
"We are absolutely over the moon and we realise that obviously we couldn't do this without you so thank you so much for all your votes - you guys are the best fans in the world," Louis Tomlinson said.
5 Seconds of Summer were in fifth place with 18.4 million votes, Lady Gaga was fourth with 25 million votes and Lana Del Rey was the highest scoring female singer and came in third place with 27 million votes.