Joe and Nick Jonas snap a photo with the cast of "Adventure Time."

We're just gonna go ahead and say it: Joe Jonas and Nick Jonas have been having an effing BALL together lately! Yes, they've also been chilling with brother Kevin, having a bazillion brunch dates, announcing reunion shows (!!), writing music, having in-studio Nerf Gun wars, and Twitter hacking. (Not to make you feel bad, Kev!) And as if that weren't enough, Joe and Nick just duetted with John Stamos, aka Uncle Jesse from "Full House"!, and now LOOK -- they're hanging out with the cast of Cartoon Network's "Adventure Time"! Not a bad few days, eh?

Joe recently posted the photo to his Instagram account with the caption, "This is happening.." And all we can say is, why not? Between this, the Nerf war, singing with Uncle Jesse, and Twitter hacking, we are now fully convinced that the Jonas Brothers are some dudes we'd like to hang out with -- clearly they're not afraid to have an AWESOME time wherever they go. Isn't that what life's all about, anyway? Not taking yourself too seriously, and impromptu duets with John Stamos? And Cartoon Network-themed Instagrams?

Photo credit: Joe Jonas' Instagram