"Glee" cast performs on Britain's number one talent show.

Glee fans in the United Kingdom were Gleeking out on Sunday as stars of the Fox musical comedy took center stage on Britain's popular talent show, "The X Factor." The cast performed the Regionals' version of "Don't Stop Believin'" to a standing ovation from the show's judges, including Simon Cowell. Except for Chris Colfer (Kurt Hummel) who had to remain in Los Angeles to film scenes for "Glee," the entire New Directions group made the trek to Britain to promote their upcoming 2011 Glee Live! In Concert! European Tour.

Those who don't subscribe to British channel ITV2 can check out "The X Factor" video performance below:

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