The actress, currently starring on Broadway in The Heiress, posted this adorable snapshot -- taken outside Walter Kerr Theatre -- to her official Facebook fan page along with the message "Look, it's me on Broadway!"
The Oscar-nominated Chastain, who plays the painfully shy Catherine Sloper, also praised her colleagues, writing "Working with this group has been so inspiring."
And what a group it is: her fellow cast members include Downton Abbey's Dan Stevens, Oscar nominee David Strathairn, and stage legend Judith Ivey, with multi-award winner Moises Kaufman serving as director. The production officially opens on November 1.
One thing's for certain: you're never not excited about being in a Broadway show.