VIDEO : Robert Downey Jr. Pokes Fun At T. Swift And Tom Hiddleston On Instagram

Actor Tom Hiddleston has finally joined Instagram and his friend Robert Downey Jr. decided to help his friend gain followers. In order to do so, Downey decided to have a little fun with an image taken by the paparazzi of Hiddleston wearing an "I heart T.S." shirt. Downey posted the picture on his own Instagram account with the caption, ?Join me in welcoming the biggest T. Stark fan of them all to Instagram!? Referencing of course, Downey's Marvel character Tony Stark.