Prior to Jennifer Lawrence, Rebecca Romijn played Mystique back in the original X-Men movies.
Mystique is a blue-colored mutant who has the ability to shapeshift, so both Rebecca Romijn and Jennifer Lawrence had to have the prosethetics and makeup applied while in their birthday suits.
"Flashback. Pre paint #Mystique prosthetics #Xmen," Rebecca Romijn posted about the first image.
"An actor prepares... #Xmen #Mystique #Mutant #Transformation #Flashback," she said about the second.
Rebecca Romijn was actually featured in four X-Men movies, X-Men, X-Men 2, X-Men: The Last Stand, and she had a cameo in X-Men: First Class.
Rebecca Romijn can be seen in The Librarians on TNT and has The Swinging Lantern Stories coming out next year.