Taylor Swift and Tom Hiddleston have already passed quite a few relationship milestones: They鈥檝e met each other鈥檚 parents, spent holidays together (who could forget that epic Fourth of July party when they first appeared聽together on Instagram?) and have even gone on several romantic vacays (swoon!).

taylor swift tom airport

They just may have passed the most important milestone of all, though 鈥 at least as far as social media is concerned!

Tom made his Instagram debut just three days ago, but he already has one of the most famous followers in the world 鈥 his girlfriend, Miss Taylor Swift. She, in turn, gained Loki as a follower right back, making these two a totally, 100% bonafide Instagram-official couple 鈥 squee!

Tay wasn鈥檛 the only one feeling her man鈥檚 social media debut, however: Tom鈥檚 Avengers co-star, Robert Downey Jr., was also on board with Loki鈥檚 Instagram account. Like, really on board.

Welcoming his mate to the platform by reposting the infamous pic that announced his true feelings for Tay (鈥淛oin me in welcoming the biggest T. Stark fan of them all to Instagram,鈥 he joked, a nod to his own Iron Man character), Robert later upped the ante by sporting a (photoshopped?) version of the shirt himself.

Donning a black tank emblazoned with the words 鈥淚 *heart sign* Loki,鈥 Robert made it clear that Taylor has some *serious* competition in the #1 Hiddleston fan department.

So what say you, Tay? Will you fight to defend your would-be title?

We, for one, can鈥檛 wait to find out.

Do you think social media plays an important role in relationship status? Tell us over @BritandCo!

(Photo via starzfly/Bauer-Griffin + Jason Merritt/Getty)