Thursday, November 25, 2010 10:31am ET by  
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Glee to perform on X Factor's semi-finals

Hit television series Glee has announced plans to perform on the X Factor’s semi-final show on December 5.

In what will be the first time the cast has performed outside of the U.S, the show’s creators are keeping the song choice firmly under wraps and have released no information or hint at what might be sung.

This news comes just after the announcement of a Glee 2011 UK and Ireland tour, for which the tickets go on sale on Friday, November 26. 

Watch the Glee cast and its new addition cover Jason Mraz's track, 'Lucky', here: