They've been teasing fans since June 25, and now One Direction's newest and highly anticipated new track, "Best Song Ever," has hit the internet early after being leaked by an anonymous source. Is it truly the band, and the world's, "best song ever?" Listen to the leak now and decide for yourself!

A short video accompanied the announcement of the new track, first tweeted by band member Niall Horan. "Hey guys... we've got a little something we wanted to share with you...," he wrote.

Liam Payne mentioned in the video that the new song appears in the movie trailer for the upcoming One Direction film, "This Is Us," set to hit theaters August this year. Fans were soon able to pre-order the new track from the mega-successful British boy band.

The official single cover for the new track was revealed through fans' use of the hashtag "#BestSongEver" on July 3 via Twitter.

The band has been releasing a number of funny video previews for the "Best Song Ever" video, as the band "can't wait for everyone" to see it. The video and song will officially premiere in six days.