Chris Colfer Joins Darren Criss for 'Glee' Reunion Performance in London

During a special one-night-only concert at London's Royal Albert Hall, Darren Criss surprised attendees by welcoming his former "Glee" co-star Chris Colfer to the stage. The duo reunited to perform their iconic "Glee" duet, "Baby It's Cold Outside."

The performance served as a nostalgic moment for fans of the beloved musical television series, bringing the characters of Kurt Hummel and Blaine Anderson back to life. Criss initially began the song solo before Colfer's unexpected appearance, eliciting a strong positive reaction from the audience.