Joe Jonas is going into the serious road with girfrield Demi Lovato as he’s planning to but her a promise ring. Rumor has it the Jonas Brother has asked his sister-in-law, Danielle Delleasa, to help him buy a rock for Demi as a symbol of his commitment to her. A source said, “Joe has been looking online for a ‘promise ring’ to get Demi for their upcoming anniversary. [Sister-in-Law] Danielle has been helping him with his search. Just yesterday they looked at rings from Tiffany & Co. He wants something special he can get engraved with their initials…He’s being very picky!”