Robert Downey Jr. Just Welcomed Tom Hiddleston to Instagram in the Best Way Possible

Actors are pals and co-stars

Robert Downey Jr. is all about Tom Hiddleston joining Instagram.

The award-winning actor posted a shot of Taylor Swift's beau from his Fourth of July vacation (you know the one, where he was wearing his I heart T.S. tank top) and wrote a hilarious caption to boot.

"Join me in welcoming the biggest T.Stark fan of them all to Instagram!" Well done, RDJ, well done.

The 35-year-old Brit joined the social media platform earlier today and posted his debut shot in his Marvel character Loki.

A photo posted by Robert Downey Jr. (@robertdowneyjr) on Aug 9, 2016 at 3:09pm PDT

"He's back!" Hiddleston wrote presumably from the set of Thor: Ragnarok, which has been filming in Australia over the past several weeks.

And while Hiddleston has already garnered almost a half of a million followers, he has yet to take the plunge and follow anyone himself on Instagram.

Hmmm…let's see how long it takes for him to comment on his co-star Downey's Instagram pic!