Who would have guessed?

Jonas Brothers’ grand reunion secret almost got out because of one of their own!

In an interview given by the Boy Band on The Tonight Show starring Jimmy Fallon on Wednesday (June 12), Kevin Jonas revealed that his first born Alena let the cat out of the bag.

As reported by www.justjared.com Kevin revealed: “She did tell her entire school that the Jonas Brothers’ were coming back — before the Jonas Brothers’ were (officially coming back).”

Five-year-old Alena told her classmates and friends about the big Jonas Brothers’ reunion, prior to the big reveal. The website went on to reveal band member Nick Jonas’s reaction: “We were trying to keep it a secret for basically a year. “We were making this documentary Chasing Happiness. And we’re like, ‘We got this on lock. No one’s gonna tell.’ Kevin comes home and says, ‘Guys, Alena told her whole class.’ Luckily, those five-year-olds were tight-lipped.”