Robert Downey Jr. is taking on the Twittersphere and the Iron Man actor recently gave fans a behind-the-scenes look at Avengers: Age of Ultron.

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The Tony Stark actor joined Twitter for the first time in early April and he was quick to oblige his fans requests for a peek behind the Marvel curtain.

While it isn't much, Downey's April 22 photo shows himself alongside Age of Ultron executive producer Jeremy Latcham. It's fairly impossible to glean any spoilers from the photo, as per Marvel Studios' intense attempts at secrecy, but the new snap does prove that Downey has finally joined the rest of the Avengers on set.

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Mark Ruffalo hinted that Iron Man would soon be making an appearance at the films Shepperton Studio set in Surrey, England last week, and now it appears as if Downey has officially arrived.

Filming for Iron Man's Avengers 2 role actually started last month in Johannesburg, South Africa, but Downey didn't need to be on hand since director Joss Whedon only need to capture clips of his Hulkbuster armor. It doesn't look as if Downey was needed at the Italy or South Korea filming locations either.

Find out what Stark and the rest of Earth's Mightiest Heroes are up too when The Avengers 2: Age of Ulton hits theaters on May 1, 2015.