Robert Downey Jr. Welcomes Tom Hiddleston to Instagram by Trolling His Co-Star's Custom Taylor Swift Tank

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Taylor Swift and Tom Hiddleston at LAX International Airport in Los Angeles on July 6, 2016. 

Robert Downey Jr. is legendary for his on-set pranks. But on Tuesday he took the teasing to Instagram when he trolled his Avengers co-star Tom Hiddleston just hours after the Thor actor announced his debut on the photo-sharing service. "He's back!" Hiddleston wrote on his first (and so far only) post alongside a winking, metal horns-throwing selfie.   

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He's back!

A photo posted by Tom Hiddleston (@twhiddleston) on

 

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Downey was super psyched for his pal (who already has more than 500,000 followers), so he re-posted the infamous pic of Hiddleston sporting his custom "I Heart T.S." tank top from the 35-year-old British actor's fourth of July getaway with girlfriend Taylor Swift. The caption said it all: "Join me in welcoming the biggest T.Stark fan of them all to Instagram!" 

 

 

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

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