PHOTO CALL: Lindsay Lohan, Rex Lee and Perez Hilton on May 15 "Glee" Episode

Lindsay Lohan, Rex Lee and Perez Hilton on May 15 "Glee" Episode

Matthew Morrison and Jayma Mays

Adam Rose/FOX

http://images.playbill.com/photo/g/l/gleelohan8.jpg — Adam Rose/FOX

Matthew Morrison, Jane Lynch and Jayma Mays

Adam Rose/FOX

Lindsay Lohan and Rex Lee

Adam Rose/FOX

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Amber Riley and Chris Colfer

Adam Rose/FOX

Harry Shum Jr., Damian McGinty, Samuel Larsen and Lea Michele

Adam Rose/FOX

Vanessa Lengies and Samuel Larsen

Adam Rose/FOX

Harry Shum Jr. and Damian McGinty

Adam Rose/FOX

Jane Lynch and Matthew Morrison

Adam Rose/FOX

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The May 15 and May 22 episodes will be special two-hour events. Here's how Fox describes the May 15 episode: "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, the New Directions perform at Nationals for celebrity judge Lindsay Lohan (guest-starring as herself)."

In the May 22 season three finale, according to press notes, "graduation is finally here, as McKinley High's class of 2012 looks to the past and present, while contemplating the future."

"Glee" airs Tuesday nights at 8 PM ET on Fox. For more information visit Fox.com/Glee.