Demi Lovato and Wilmer Valderrama … No Longer an Item?Demi Lovato and Wilmer Valderrama … No Longer an Item?Uh oh … Is Demi Lovato mending a broken heart? The singer/actress is known to voice her emotions through her Twitter page, and she was at it again on Tuesday afternoon (Jan. 10).Alanna ConawayAlanna Conaway