JUST ADDED: 5 Seconds of Summer will be rocking the stage at this year's iHeartRadio Music Festival Village in Las Vegas! The band sat down with Ryan Seacrest to break the news. Click here to buy your tickets now, before they sell out!
American Authors have a huge hit on their hands with "Best Day Of My Life," but whose life is better than a very happy puppy? Check out the video re-imagined, from the dog's perspective, of course!