<p>Robert Downey Jr is all about Tom Hiddleston joining Instagram.</p>
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<p>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 TS tank top) and wrote a hilarious caption to boot.</p>
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<p>"Join me in welcoming the biggest T Stark fan of them all to Instagram!" he wrote poking a bit of good-natured fun at Hiddleston's high-profile romance with the pop princess.</p>
<p><img title="Robert Downey Jr and Tom Hiddleston" src="http://images.mid-day.com/images/images/2016/aug/11Robert-Downey-Jr-1.jpg" alt="Robert Downey Jr and Tom Hiddleston" /><br /><strong><span style="font-size: x-small;"><em>Robert Downey Jr and Tom Hiddleston</em></span></strong></p>
<p>The 35-year-old Brit joined the social media platform on Tuesday and posted his debut shot in his Marvel character Loki.</p>
<p>"He's back!" Hiddleston wrote presumably from the set of Thor: Ragnarok, which has been filming in Australia over the past several weeks.</p>

Robert Downey Jr is all about Tom Hiddleston joining Instagram

When Iron Man welcomed Loki to Instagram

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