No, Demi Lovato & Wilmer Valderrama Are NOT Engaged -- But Could There Be A Wedding On The Horizon??

Say whattttt?? These two have been together for a very longtime, but seeing a giant rock on Demi Lovato's finger would definitely be a bit of a shocker! And a little songbird by the name of Wilmer Valderrama just hinted at possibly putting a ring on Demicorn's hand — soonish! [ Photos: 15 Celebrities Couples That Should Get