Gleeks, prepare to say ¡Hola clase! to some old pals — and a new one.

Chace Crawford, Gwyneth Paltrow and Kristin Chenoweth are joining the growing list of stars who’ll be on hand for the Fox musical dramedy’s two-part 100th episode, per The Hollywood Reporter.

Paltrow’s Holly Holiday, substitute teacher and former romantic interest of Matthew Morrison’s Will Schuester, is reportedly in talks to reprise the role that won her an Emmy in 2011.

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During the milestone episode — which will air on March 18 and 25 — Sue Sylvester successfully shuts down New Directions, leading to Mr. Schue’s departure. A host of original cast members and guest stars will return to bid Morrison’s character goodbye, among them Dianna Agron, Heather Morris, Amber Riley, Harry Shum Jr. and Mark Salling.

Chenoweth, who took home an Emmy for her portrayal of former glee-club hotshot April Rhodes, also will return for the farewell (though Morrison is not leaving the show). Show boss Ryan Murphy tweeted the news Wednesday.

https://twitter.com/MrRPMurphy/status/408376420650323968

Gossip Girl alum Crawford will play “kind of a Yalie degenerate” who’s involved with Agron’s Quinn, E! Online reports.

The episodes that immediately follow will focus on the show’s New York City contingent, including Lea Michele’s Rachel and Chris Colfer’s Kurt.

THR reports that the show’s creative team is still shaping the rest of Season 5.

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So what’ll the super-sized cast sing for the big occasion? The folks at mjsbigblog recently posted a list of songs and who’ll perform them (see below), noting that info about a final song featuring Holly hasn’t yet been released.

Pink’s “Raise Your Glass” — Will and April

“Defying Gravity” from Wicked— Rachel, Kurt and Mercedes

The Zutons’ “Valerie” — Santana and Brittany

Avril Lavigne’s “Keep Holding On” — Puck

Britney Spears’ “Toxic” — Quinn, Brittany and Santana

Florence + the Machine’s “Dog Days Are Over” — Holly and New Directions

Got thoughts about Glee‘s 100th? Sound off in the comments!