Gwyneth Paltrow makes 'Glee' Live cameo, sings 'Forget You'

The "Glee" Live tour is sort of confusing. It's all your favorite cast members from the FOX series performing outside of the confines of television... but they're still in character.

And that concept apparently extends to surprise guests as well. Familiar "Glee" face Gwyneth Paltrow showed up at the June 16 outing of the tour in East Rutherford, New Jersey, and she was wearing substitute teacher Holly Holliday's clothes.

Paltrow, as Holliday, sang her now-famous take on Cee Lo Green's "Forget You."

And the cameo wasn't a coincidence. This particular performance was being taped for the "Glee Live! 3D!" which hits theaters August 12.