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It's tough to tell where Robert Downey, Jr. ends and Tony Stark begins. After almost a decade in the Iron Man suit, Stark's hilarious snark has gotten into his bones. On Tuesday, Downey welcomed his Avengers enemy Tom Hiddleston to Instagram with a little joke about Hiddleswift.

Join me in welcoming the biggest T. Stark fan of them all to Instagram! @twhiddleston

A post shared by Robert Downey Jr. (@robertdowneyjr) on

“Join me in welcoming the biggest T. Stark fan of them all to Instagram!" Downey joked, the "I heart T.S." shirt maybe making more sense that way.