LOS ANGELES, Aug 10 — Guess who just joined Instagram, probably thanks to coaching from the new lady love in his life who just happens to have probably the most fan following on that social media platform: Tom Hiddleston!

And trust Robert Downey Jr to mark this milestone in a way only Tony Stark could have: By poking fun at Hiddleston’s whirlwind romance with Tay Tay of course.

Downey Jr posted a hilarious photo of Hiddleston wearing that infamous fitted "I Heart TS” shirt from the early days of his whirlwind romance with Taylor Swift.

"Join me in welcoming the biggest T. Stark fan of them all to Instagram! @twhiddleston,” Downey Jr captioned the post.

Hiddleston’s first snap on Instagram was a pictur of himself dressed up as Loki for the Marvel sequel alongside the caption: "He’s back!”