Answer
The answer is "Iron Man 2". In this movie, Munn's character, Christina Everhart, is a news reporter who covers Tony Stark's activities as Iron Man. The film boasts an impressive cast, including Robert Downey Jr. as Tony Stark/Iron Man, Gwyneth Paltrow as Pepper Potts, Mickey Rourke as Ivan Vanko/Whiplash, and Samuel L. Jackson as Nick Fury.