Joe Jonas isn't letting the personal troubles of his ex-girlfriend Demi Lovato hamper his blossoming romance with Twilight star Ashley Greene. While Lovato recovers in rehab following a breakdown on the Camp Rock 2 tour (spurred, many believe, by Jonas' decision to bring Greene along on the tour), Joe and Ashley (deemed "Jashley" by some, "Gronas" by others) are going full speed ahead with their relationship. Sources tell E! Online that Joe has fully ingratiated himself to Greene's family, and that the pair plan to spend the holidays together. Says one friend of the couple's, "They are happier...