BODY DOUBLE!

Did you know that in Hannah's concerts, she's been using a BODY DOUBLE?! It was only for a quick costume change. See, at the concert, Hannah would change outfits really fast. We figured it out. We saw it on the news, but we didn't notice it in the concert.
Let me tell you what happened:
Some dancer in the production put a black sheet around Hannah. It was dark in the room, so you couldn't tell. Then Hannah went into a secret door. The BODY DOUBLE came out fast, dressed in the same outfit. She had sunglasses on, and the wig was in her face, and her back was towards the audience most of the time. Hannah, (the real one) was in the secret room changing. There was some sort of que that sent the BODY DOUBLE back into the secret door and Hannah came out with a different outfit on. It made it look like Hannah could change really fast. My question is, how could the BODY DOUBLE come out and sing? She wouldn't sound like Hannah! My guess was that they recorded her singing just for that 15 seconds the fake was out there, and the fake was lip synching. I think they timed it so that when Hannah came back out, she could sing. It was not noticable at all. Someone at the concert just had a video camera and happened to get it on tape! The first video is just pictures that show it's definately NOT Hannah! The second one is the real concert tape. Watch them if you want to see the proof: