WATCH: Selena and Demi on 'Barney and Friends'

Selena Gomez and Demi Lovato's best friendship goes all the way back to an inflatable pool on Barney and Friends, and we found video proof! A tiny Selena is in the blue bathing suit and a tiny Demi is in the purple. How adorable were they? We think the two should rerelease a modern upbeat duet of "If I Lived Under the Sea, Sea, Sea," don't you agree-gree-gree?