X-Men: Days of Future Past Adds Patrick Stewart, Ian McKellen to Jennifer Lawrence and Michael Fassbender Flick

Director Bryan Singer reveals via Twitter which stars are set to appear in the highly anticipated sequel

It's a good day to be an X-Men fan!

Director Bryan Singer has announced via Twitter that Patrick Stewart and Ian McKellen are set to reprise their roles as Professor X and Magneto in the upcoming X-Men: Days of Future Past.

And if that alone wasn't enough, Singer, who directed X-Men and X2, went on to share with his followers that several of the stars from the most recent flick in the franchise, X-Men: First Class, would also be returning.

"I'd like to officially welcome back James McAvoy, Jennifer Lawrence, Michael Fassbender, & Nicholas Hoult to #XMEN for#DaysOfFuturePast," Singer tweeted on Tuesday.

Of course, both McAvoy and Fassbender played younger versions of Professor X and Magneto in First Class, so the involvement of Stewart and McKellen this time around should make for an exciting new storyline.

Filming on X-Men: Days of Future Past is scheduled to begin early next year.