If you don't have very young children, there's a chance that the Nickelodeon show 'Yo Gabba Gabba!' isn't on your radar. The series features four brightly-colored monsters learning lessons about nutrition, hygiene and sharing - from each other and their good buddy Lance Rock, a live-action role played by a Los Angeles DJ in orange spandex and a wacky hat.

So why are more and more adults jumping on the 'Gabba' bandwagon? Its roster of unassailably cool guest stars and A-list celebrity fans might have something to do with it.