The 35-year-old "Avengers" star joined Instagram earlier this week.
Hiddleston started following many of his co-stars and colleagues, including Robert Downey Jr, Chris Hemsworth, Mark Ruffalo, Samuel L Jackson and official page of Marvel Studios.
The "Iron Man" star welcomed the British actor by posting a photo of him wearing "I [heart] TS" shirt from his Fourth of July vacation.
"Join me in welcoming the biggest T Stark fan of them all to Instagram," he had captioned the picture.
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