America's Got Talent Features One Direction!

One Direction appeared on last night's episode of America's Got Talent to promote their upcoming movie This Is Us and perform their hit song "Best Song Ever."America's Got Talent

One Direction's 3D documentary film, This Is Us, premieres tomorrow! Today is your last chance to enter our "Best Time Ever" contest for a chance to win tickets to see the movie, plus Live Love Move One Direction school supplies from Office Depot! Click here for contest details!

During last night's results show on America's Got Talent, the boys performed their latest single to a crowd of screaming Directioners and spoke a little about what the new movie has in store.

"I think it's just a great chance for the fans to see what they want to see," Harry Styles said after the band's performance. "It was like backstage, what happens behind closed doors and stuff like that."

If that news wasn't exciting enough, today is also band member Liam Payne's 20th birthday! Leave your birthday wishes for Liam in the comments section, and tell us what you think of last night's performance, which you can watch below!