X-Men: Days of Future Past director Bryan Singer has tweeted a sneak peak of one of the movie's biggest stars in costume.
Singer's photo shows Oscar-winner Jennifer Lawrence dressed in a blue body suit for her role as the mutant Mystique.
He earlier tweeted a photo of Game of Thrones star Peter Dinklage preparing for his as-yet unknown part in the movie.
Singer directed the first two X-Men films and produced the recent prequel X-Men: First Class.
X-Men: Days of Future Past will unite the First Class cast with original X-Men cast members Patrick Stewart, Hugh Jackman and Ian McKellen.
The director previously said he would use the movie's time travel-based storyline to "correct a few things" from previous movies.