The season finale, which is scheduled for May 24 at 9 PM ET, will concern New Directions heading to Nationals in Manhattan to compete in the ultimate singing showdown.

While in New York City, Rachel (Lea Michele) and Kurt (Chris Colfer) will run into LuPone at the famed midtown restaurant Sardi's.

Michele recently tweeted, "On set right now working with one of my all time idols. Another day where glee makes one of my dreams come true."

For her performance as Rose in the recent revival of Gypsy at the St. James Theatre, Patti LuPone won the Tony Award, the Drama Desk Award, the Outer Critics Circle Award and the Drama League's Distinguished Performance Award. A Tony Award winner for her work in Evita, LuPone also earned an Olivier Award for her performances in the West End productions of Les Misérables and The Cradle Will Rock. Her other theatrical credits include  Company, Women on the Verge of a Nervous Breakdown, Sunset Boulevard, Anything Goes, Oliver!, Working, The Old Neighborhood, Master Class and Pal Joey. LuPone also headlined two solo Broadway concerts, Patti LuPone On Broadway and Matters of the Heart, and received glowing notices for her performance as Mrs. Lovett in the Lincoln Center concert version of Stephen Sondheim's Sweeney Todd and a Tony nomination for her performance in the recent revival of that Sondheim work. She was seen in the Kennedy Center's staging of Marc Blitzstein's Regina and joined Audra McDonald for Los Angeles Opera's production of Kurt Weill and Bertolt Brecht's Rise and Fall of the City of Mahagonny. She was also seen as Rose in a Ravinia Festival concert run of Gypsy. Her screen and recording credits are numerous.

"Glee" airs Tuesdays at 8 PM ET on Fox.