VIDEO: Gwyneth Paltrow Performs 'Forget You' With 'Glee' Cast On London Stage

If you thought that Gwyneth Paltrow's Glee associations were limited to the occasional television appearance, you may be surprised to hear that Paltrow joined the cast of the hit FOX show onstage in London as part of their summer tour on Wednesday night.

Paltrow, 38, stole the show in her multiple guest spots on last season's Glee as sexy substitute teacher, Holly Holiday, who heated up the screen with Matthew Morrison's Mr. Schuester. Her breakout Glee performance led to worldwide shock and awe that the beautiful blonde actress could actually carry a tune and hold her own among the Glee mainstays.

Right before the show Lea Michele tipped off her Twitter followers about the surprise appearance. "Cat's out of the bag! @Gwyneth Paltrow here tonight to do a special performance of 'Forget You!' We love you Gwyneth!" Audiences roared when Paltrow hit the stage at the O2 arena wearing a short black dress and patent leather heels, and the crowd become even more riled when the music for Cee Lo Green's "Forget You" began to play, indicating that Paltrow was going to reprise her most famous Glee performance while shaking it onstage with the rest of the cast. Her moves included "the robot" and a brief boogie with Chris Colfer.

The Glee cast will have one more London show before continuing their tour in Doublin for four-night stint.

Watch Paltrow's performance here: