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.

GLEE is a musical comedy about a group of eager and ambitious students who strive to outshine their singing competition to win Nationals while navigating the cruel halls of McKinley High. Since its debut, GLEE has become a bona fide cultural phenomenon, received prestigious honors including the Golden Globe and Peabody Award and singlehandedly made glee clubs cool again.

GLEE is produced by Ryan Murphy Television in association with 20th Century Fox Television. Ryan Murphy, Brad Falchuk and Ian Brennan are co-creators of the series. Murphy, Falchuk, Brennan and Dante di Loreto serve as executive producers.

For more photos, click here!

Photo Credit: Adam Rose