Chicago actress Nina O'Keefe is currently starring in the play Heddatron, which is about a woman who is kidnapped by robots. Her boyfriend, Erik Schroeder, works for a different theater company, but was called on stage for the curtain call because it was his 30th birthday. However, that was just a ruse.

After Sunday's show, Schroeder was called up on stage, ostensibly so the cast, crowd and the robots involved in the play could sing happy birthday, but instead of receiving the birthday song -- and prompted by a robot -- Schroeder pulled out a ring and proposed to his girlfriend of six years (watch video below).

"It was my great grandmother's sister's ring," said Schroeder. "She had to take off the costume ring she was wearing for the play, but I was lucky because it fit perfectly."

And of course, O'Keefe said yes.

After which the robots serenaded the happy couple. The proposal was captured on video. Link -via Fark