Rooney Mara Will Have Awkward Reunion With Ex In 'Blackbird'!

Rooney Mara keeps it comfy in black after making a sweat at a ballet class on Thursday (November 20) in Santa Monica, Calif.

It was recently announced that the 29-year-old actress and Ben Mendelsohn will be starring in the upcoming film Blackbird, which is slated to shoot in the U.K. in summer 2015.

PHOTOS: Check out the latest pics of Rooney Mara

The Benedict Andrews-directed film centers on two people who are “uncomfortably reunited 15 years after they had an illicit sexual relationship.”

15+ pictures inside of Rooney Mara stepping out of a ballet class…