In the latest Hollywood "on and off again couple" news, Demi Lovato and Wilmer Valderrama may or may not be back together again. The X Factor judge and the That '70s Show alum have been playing hot and cold since 2010, but things may be "hot" for them as of now. They have been spotted doing couple-like things around Los Angeles such as having a "romantic" sushi dinner on Valentine's Day and canoodling at the grand opening of a Top Shop. At the dinner, a "source" says that they were looking longingly into each other's eyes before they even touched their dinner. Has it ever crossed anyone's mind that maybe — just maybe — they were having a staring contest?