Demi Lovato and Simon Cowell have an undeniable love/hate chemistry on their hit TV show, "The X Factor." And on Wednesday the 20-year-old starlet proved that the teasing isn't just an act, but it extends off-camera, as well! Demi posted a throwback pic of Simon sporting a tight white V-neck tee and suspenders with the caption, "Well, well. Look at this ancient pic I found!! Same t-shirt, same middle part. Recognize this @SimonCowell??"