Best Song Ever To Be One Direction's Next Single!

The first full-length trailer for One Direction's upcoming 3D documentary film, This Is Us, has finally hit the internet, and it features the "Best Song Ever!"

The new trailer is more than three minutes long and features One Direction's never-before-heard upcoming single called "Best Song Ever!" Though only a tiny clip of the song is heard in the trailer, we can tell it's going to be another hit.

Best Song Ever- 1D as kids

If you're super anxious to get your hands on the "Best Song Ever," you can already pre-order its EP!

The EP includes "Best Song Ever," plus two remixes of the two song, as well as a live version of their last single, "Kiss You!"

We NEED to hear the rest of the "Best Song Ever." What do you think of the short clip you get to hear in the video?

The movie will show the boys on tour and give us all a glimpse into the crazy lives they lead!

If this trailer is any indication of what the movie will be like, we'll also get the meet the families of One Direction and see a lot of adorable pics of them as kids!

We love that this trailer features Simon Cowell, who coached them on The X Factor and helped to make them the massive success they are today.

We absolutely CANNOT wait until August 30 to see this movie.  To check out the trailer, just click here. Who else is super exciting to don their 3-D glasses and have the movie-going experience of a lifetime?