Demi Lovato discovered she has an older half-sister and recently connected with her for the first time.The 'Skyscraper' singer has revealed she recently reconnected with her long lost older sibling, who she only found out about this year.The 20-year-old star told Long Island, New York web radio station WBLI on Monday (04.03.13): "I think my fans would be excited to learn that I just got to know I have an older sister that I've never known my whole life."I actually have a third sister that I didn't even know about until this year. She's in her thirties. She's my half-sister, but I talked to her for the first time in my life when I turned 20."I asked her 'Why haven't you ever contacted me?' and she said 'I never wanted you to think that I ever wanted anything from you, so I've just kind of been waiting to see if you wanted a relationship.' I thought that was so incredible!"The 'X Factor' USA judge, who has two other sisters Dallas and Madison - also recently rekindled her relationship with Wilmer Valderrama for the third time.The 'Give Your Heart A Break' singer - who has dated the former 'That 70s Show' star on and off since 2010 - spent Valentine's Day (14.02.13) with the 33-year-old actor at Takami Sushi & Robata Restaurant in downtown Los Angeles, where they cuddled throughout their meal.Demi - who checked into rehab for three months in October 2010 where she successfully received treatment for her eating disorder and problem with self-harming - recently revealed that she is finally in a place where she wants to be in a relationship.