Natalie Cole - UnforgettableThe world is in mourning for Natalie Cole.Following news of her death Thursday night, her friends, colleagues and admirers have taken to social media to express their grief over the loss of the legendary singer."More like family than friend was Natalie, Dionne Warwick said in a statement to ET. "My heart aches. My sincere condolences to her family and may she now rest in peace."GRAMMY producer...