The show's excited creator Ryan Murphy confirmed the news, sharing a picture of the pair on set with the caption, "They're back."
Popular guest stars Gwyneth and Kristin are returning for Glee's 100th episode
The highly-anticipated 100th episode will see Jane Lynch's principal Sue Sylvester finally succeed in ending the Glee club in Lima after years of disdain for the New Directions and Will Schuester (Matthew Morrison).
Chace Crawford is scheduled to make a guest appearance, playing "Dianna Agron's boyfriend, whom she brings to Lima to meet her friends," US Weekly reports.
The two-part episode will see Sue Sylvester finally end the Glee Club in Lima
The show is then set to do several back-to-back episodes in New York City, centering on Rachel (Lea Michele), Blaine (Darren Criss), Kurt (Chris Colfer), Sam (Chord Overstreet), Mercedes (Amber Riley), and potentially other co-stars.
The two-part 100th episode will air on 18 and 25 March. It will feature at least 10 new remixes of Glee's greatest hits, as voted for by fans.