GLEE: Perez Hilton guest stars as one of the judges for Nationals in the second hour of a special two-hour "Props/Nationals" episode of GLEE airing Tuesday, May 15 (8:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. Cr: Adam Rose/FOX Photo

From: Photo Flash: Perez Hilton et al. in New Stills from GLEE's 'PROPS' and 'NATIONALS' Episodes!

On May 15, FOX will air two back-to-back GLEE episodes, entitled 'Props' and 'Nationals'. As the countdown to graduation continues, the kids of New Directions prepare a high-concept routine for Nationals. When Tina (Jenna Ushkowitz) bumps her head, the world of New Directions is turned upside down in her eyes. Then, New Directions face off against Wade (Alex Newell) and Vocal Adrenaline at Nationals in Chicago, where they perform in front of celebrity judge Lindsay Lohan (guest-starring as herself). Check out new photos from the episodes below, including Perez Hilton as a Nationals judge, Lea Michele performing solo at the competition, and Matthew Morrison, Jane Lynch and Jayma Mays prepping for the show-down.