Darren Criss Recalls Choreographic Challenges Filming Iconic "Teenage Dream"
As part of an ongoing celebration, the cast of FOX's hit musical dramedy series Glee looks back at the musical highlights of the series so far as we anticipate the upcoming second part of the two-part 100 episode extravaganza tonight, with GLEE breakout star Darren Criss recalling his nail-biting breakthrough performance of the Katy Perry hit 'Teenage Dream'.