X-Men 3 (2006)
Sigourney Weaver was apparently set to play Emma Frost in Bryan Singer's "X-Men 3," but the idea was disbanded when Singer left the project.
Ashley Hartman was also rumored to play Emma Frost in Ratner's "X-Men 3," but she was a last minute add on that was later dropped.
Emma actually appeared in the Marvel Logo Flipbook which is found before the beginning of X-Men 3:
See, half of her face. Awesome, huh? Not only that, the 3 Stepford Cuckoos appear as background characters in the school. According to Chris Claremont's novelization of "X-Men: The Last Stand," a headmistress from an incredibly pricey school sent them to Xavier's Institute.
Emma Frost Movie
In 2006 USA Today reported Fox Studios might plan an Emma Frost movie directed by David O. Russel, but nothing has been heard about the movie since then.
X-Men Origins: Wolverine (2009)
Emma Frost (Tahyna Tozzi) makes a brief appearance in the X-Men Origins: Wolverine trailer. She is seen among the prisoners of Weapon X and helps Cyclops and the rest of the mutants escape the prison.
X-Men: First Class (2011)
January Jones plays Emma Frost in this X-Men prequel, which focuses on the early history of Professor X and Magneto and the formation of the X-Men. Although Emma appeared as a young teenager in "X-Men Origins: Wolverine," Bryan Singer said some liberties were taken to make the plot work with the movie. Emma is a member of the Hellfire Club and close ally of Sebastian Shaw (Kevin Bacon).
This is the first movie in which Emma Frost is written as a supporting character.