The guys and girls of Glee were hard at work yesterday in LA. Cory Monteith , Chris Colfer, Harry Shum, and Matthew Morrison  all looked spiffy in suits and ties. Meanwhile, some of the girls like Lea Michele  and Dianna Agron  alternated between their comfy off-duty duds and fancier costumes. It's business as usual for the stars of the FOX hit after what was a remarkably big week for the show. Not only did the series return to TV on Tuesday night after a month of reruns, but the new episode also featured Gwyneth Paltrow singing Adele's "Turning Tables"  as she reprised her character, Holly. In addition, one of the show's onscreen singing groups, The Warblers, have an a cappella CD  that hit stores this week. We're chatting with Darren Criss himself at an upcoming signing for the album in LA, so stay tuned next week to watch our interview with him!