Gwyneth Paltrow surprised Glee fans in London last night, rocking the stage at The 02 Arena during the latest stop on the TV show's live tour. She sang her take on Cee-Lo's "Forget You" in a minidress and danced alongside her costar Chris Colfer during the performance. Gwyneth has been spending some time in her husband's, Chris Martin, hometown lately, lending her support to her friend Beyoncé Knowles at Glastonbury, and stepping out for dinner with Topshop's CEO Philip Green. This appearance was the second instance Gwyneth's rejoined the cast of the Fox series during their tour. She also stopped by the East Rutherford, NJ, concert on June 17. A special guest was along for yesterday's fun; Gwyneth tweeted that she brought four 7-year-olds, presumably including her daughter, Apple, along to the show.