VIDEO : Are Demi Lovato and Ex-BF Joe Jonas Flirting on Instagram?

Demi Lovato and Joe Jonas haven't dated in nearly 6 years. But this weekend, Lovato and Jonas decided to stir up the Internet a bit by flirting on Instagram. Jonas posted a hot picture of himself jamming out at a show. Lovato, like everyone else, noticed Jonas's rippling muscles and left quite the riveting comment. "Excuse me sir, can you show me where the gun show is?" It goes without saying, fans of the couple freaked out immediately. Could this old fling possibly be starting up again?