The summer’s first blockbuster has reached a major milestone. “Iron Man 3” became the 16th movie to cross $1 billion on Thursday after 24 days with more than $700 million of that coming from foreign markets. This is Marvel’s second movie to cross the threshold. “The Avengers” became the highest non-James Cameron movie ever last summer. Disney now has six billion dollar movies. “Iron Man 3” stars Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Guy Pearce, Ben Kingsley and more.

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