The actress will tackle the role of Tony Stark's love interest for a fourth time in the film, having previously appeared in the first two Iron Man movies and made a cameo in The Avengers.
Iron Man 3 poster featuring Pepper Potts
Paltrow has cast doubt on her long-term future in the role, admitting in a previous interview that she feels she is becoming too old to appear in action movies.
She said: "I don't know [about returning for future Marvel films], I'm getting old for this s**t, you know what I mean?"
Robert Downey Jr, Sir Ben Kingsley, Don Cheadle, Rebecca Hall, Stephanie Szostak, James Badge Dale, Jon Favreau and Wang Xueqi will also appear in the Shane Black-directed movie.
Iron Man 3 will arrive in UK cinemas on April 26, following in the US on May 3. Watch a trailer for the film below:
