Glee fans got the surprise of a lifetime Thursday night when Gwyneth Paltrow showed up at Samsung and AT&T’s Glee Live! concert to perform.

RadarOnline.com has video of the 38-year-old actress turned singer belting out Cee-Lo’s hit, Forget You, in front of a cheering East Rutherford, New Jersey, crowd.

What you don’t see on the video is that Glee star Naya Rivera was on stage bragging that fans voted her character, Santana, as the sexiest girl in the Glee club and that’s when Paltrow made her grand entrance and said, “Oh, not so fast!”