Joe Jonas may be known as the fun and carefree Jonas Brother, but he always shows off a softer side of his personality when he's hanging out with his nieces. The singer is a proud uncle to Kevin's adorable daughters, Alena, 5, and Valentina, 2. From visiting with the girls during Christmas vacation with the rest of the Jonas family to hanging out with them backstage, it's clear that Joe shares a special bond with his adorable nieces. Not to mention, the girls can't get enough of Joe's wife, Sophie Turner! Keep scrolling for some of his cutest Uncle Joe moments ahead.