♪ ♪ >> nischelle: tonight... celine dion suffers a medical crisis on camera. unable to move. unable to speak. for the first time, we see just how debilitating her stiff-person syndrome really is. then, jeremy renner shirtless and showing his scars. >> i see the one on my chest. >> nischelle: how getting crushed by a snow plow is impacting acting career. and