Video Proof:

This is Me - Demi Lovato & Jonas Brothers live
This Is Me - DC Games HQ
Camp Memories
Introducing Demi Lovato
Joe makes Demi laugh
Demi with Selena watching the Jonas Brothers performance from backstage.
Joe's pickup lines to Demi
Is Joe dating Demi? Interview with E! News
Jonas Brothers ft. Demi Lovato, duet live in London
In Tune With Demi Lovato: On The Line and Two Worlds Collide
In Tune with Demi Lovato: Get Back and Don't Forget
Jonas Brothers and Demi VMA interview
Uncut ITN Interview; tickling her, flirting, whispering & giggling
YouTube - We Rock [Crew Video]
YouTube - JB&Demi - On The Line (Kristi Yamaguchi)
House of Blues: Demi and JB preforming Get Back
House of Blues: Joe and Demi preforming Daughters by John Mayer

Joe and Demi on MM

Joe and Demi on a double date with Kevin and Danielle
Joe and Demi september 2009
Demi and Joe This is me Toronto August 2009
Demi and Joe about a Kiss in CR2
Joe and Demi - Send it on
We'll see - who knows
New Years eve hug 08/09
Radio Disney take over 09
Radio Disney take over 09 TAKE OUTS
Joe and his brothers prank Demi 08