The Jonas Brothers were very good at keeping their recent reunion [1] a secret, but Kevin's daughter Alena [2] actually spilled the beans before they made their big announcement. During an appearance on The Tonight Show Starring Jimmy Fallon [3] on Wednesday, the brothers gushed about getting the band back together and how much their lives have changed within the past 10 years [4]. While Nick and Joe are newly married [5], Kevin has two daughters who are just figuring out that he's a Jonas Brother. Kevin admitted that his 5-year-old was so excited about the Jonas Brothers [6] getting back together, she actually told her entire class. Whoops!

While chatting with the host, the brothers also took some time to reflect on their crazy outfits from the past, how their rise to fame is documented in their Chasing Happiness [7] documentary, and what it's like writing love songs about their wives [8] for their Happiness Begins [9] album. See what they had to say in the video above!