Happy Iron Man 3 release day! After Robert Downey Jr. reprised his role as Iron Man in The Avengers last summer, fans of Marvel's stories have been anxiously awaiting his return as the superhero in the third installment of the Iron Man series, and just over a year later, the time has come.

In honor of the movie's release, we're giving this week's Hot Guy Friday to Robert, and we've rounded up some of the sexiest pics of the actor. Here you go -- and you're welcome!

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What's your favorite thing about Robert Downey Jr.?