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Last Updated: Friday December 04 2009 16:48 GMT

In pictures: X Factor secret gig

Joe McElderry, Stacey Solomon, Danyl Johnson and Olly Murs

Sshhhh... X Factor semi-finalists Joe McElderry, Stacey Solomon, Danyl Johnson and Olly Murs have played a top-secret gig in London.

Each of the semi-fX Factor semin-finalist Joe McElderry

Each of the semi-finalists sang two songs for the lucky competition winners. Don't Stop Believing was one of Joe McElderry's songs.

Stacey Solomon

Here's Stacey performing! When asked who she thought would win X Factor, she said: "We are all winners!"

Olly Murs

Olly strikes a pose as he sings his heart out!

Danyl Johnson

Check out Danyl! He said his least favourite celeb guest on the show so far was Whitney Houston.