Joe Jonas is dating model Tatiana Gabriela, a source exclusively confirms to Us Weekly. "They started seeing each other at the end of the summer," the insider tells Us, revealing Gabriela has already been introduced to Jonas' friends, family and his two daughters with ex-wife Sophie Turner. Neither Jonas, 36, nor Gabriela has spoken about their blossoming romance. Us has reached out to reps for both for comment. Despite keeping their romance low-key, the Jonas Brothers musician subtly endorsed Gabriela's holiday photos.