Joe Jonas wants a dog for his 21st birthday: 'Besides a dog, I don't know. That's all I kind of wanted. I don't know what we're going to do to celebrate. These guys are not telling me what they're doing.' What superpowers would Demi and Nick like to have? Demi, 'My ideal superpower? I wish I could teleport, just snap my fingers and be in a room.' Nick, 'I think flying would be good