Daniel Cudmore

Directed Bryan Singer took to Twitter this afternoon to reveal three more additions to the rapidly expanding cast of "X-Men: Days of Future Past."

A photo of a wall in the production office (below) shows the headshots of the 13 actors confirmed for the Fox sequel, from Hugh Jackman and Halle Berry to Jennifer Lawrence and Peter Dinklage, along with three who haven't been announced yet. Perhaps most notable among those is Daniel Cudmore, who will reprise his role as Colossus from 2003's "X2" and 2006's "X-Men: The Last Stand."

The other two are "The Twilight Saga" alum Boo Boo Stewart and, as ComingSoon has confirmed, Chinese actress Fan Bingbing ("Double XPosure"). It's worth pointing out there are at least four, and perhaps as many as six, empty spaces on the wall in Singer's photo.

"Now let's blow s**t up!" the director tweeted.

They join James McAvoy, Michael Fassbender, Nicholas Hoult, Patrick Stewart, Ian McKellen, Anna Paquin, Ellen Page, Shawn Ashmore, Omar Sy and the aforementioned Jackman, Lawrence, Berry and Dinklage.

"X-Men: Days of Future Past," which opens July 18, 2014, takes its name from the1981 Marvel comics story by Chris Claremont and John Byrne that depicts a timeline created by the X-Men's failure to prevent the Brotherhood of Evil Mutants from assassinating a U.S. senator. In that alternate future, the giant robotic Sentinels have become the de facto rulers of the United States, where mutants are hunted down and placed in internment camps.