“X-Men: Days of Future Past” Red Carpet Premiere

 Watch a clip from the film "X-Men: Days of Future Past." Starring Patrick Stewart, Ian McKellen, Hugh Jackman, Jennifer Lawrence, Michael Fassbender, Shawn Ashmore, and Halle Berry. (Photo/Video: Fox)

Hopping over the pond for the world premiere of their action film, the boys of “X-Men: Days of Future Past” headed over to Odeon Leicester Square on Monday (May 12).

James McAvoy and Michael Fassbender looked dapper in their designer finery as they posed alongside co-stars Sir Ian McKellan and Sir Patrick Stewart.

 During the New York City premiere over the weekend, Jennifer Lawrence discussed her character Mystique’s role in the upcoming flick.

"This time because the future is undetermined, we have freedom to choose where we want to go with her," Miss Lawrence explained. "Is she going to become the assassin that we know her as now, like Rebecca Romijn's character? Or is she going to do what Charles [Xavier] wants and go down the path of no killing?"

“X-Men” hits theaters on May 23!