Robert Downey Jr. makes fun of Tom Hiddleston's "I Heart T.S." tank

Tom Hiddleston joined Instagram on Monday, and he's already getting ragged on by "Avengers" co-star Robert Downey Jr.

Just hours after the "Night Manager" actor joined the social media platform, he got a warm welcome from Downey, who wrote, "Join me in welcoming the biggest T. Stark fan of them all to Instagram! @twhiddleston."

Downey posted a photo of Hiddleston wearing the now-infamous "I Heart T.S." tank-top -- Hiddleston is dating Taylor Swift, in case you missed it.

But Downey seems to believe the tank is for his "Avengers" character, Tony Stark.

Somebody should let Swift know.

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

A photo posted by Robert Downey Jr. (@robertdowneyjr) on


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