She’s singin’ in the rain! When Gwyneth Paltrow makes her guest-starring turn as substitute teacher Holly Holliday on tonight’s Glee, she’ll be branching out of country music to belt out songs from the likes of Cee Lo Green and Rihanna. And it’s not just her pipes that’ll get a workout—she’ll be showing off some smooth dance moves too. Her “Umbrella/Singin’ in the Rain” mash-up with Mr. Schue involves rain, a water-covered stage and yes, umbrellas, and Gwyn describes the scene as “incredible fun.” I love the sound of the mash-up and can’t wait for this episode. Are you looking forward to Gwyneth on Glee tonight?