The co-stars were joined on the set that day by their fellow Gleek Chris Colfer.
“Beyond excited for today’s work at #Glee! Getting to sing a classic bway song with @DarrenCriss!” Lea tweeted that day. We can’t wait to find out which song it is!
Make sure to check out our recap of what happened in this week’s second part of the 100th episode!
FYI: Lea is wearing a Sebastian Gunawan Couture dress.
25+ pictures inside of Lea Michele and Darren Criss…