Jennifer Lawrence and her ex Nicholas Hoult are back on! A source tells Us Weekly they pair, who split in January, heated back up while reprising their roles as Mystique and Beast in X-Men: Days of Future Past. They started the shoot in April as friends, and then one day they just started kissing, an insider said. One thing led to another and they hooked up. All her old feelings came rushing back. Now they're fully back on. Originally the two cited distance as the reason for the split, so we'll wait and see what happens once filming wraps!