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Take That have invited The Pet Shop Boys to support them on this summer's Progress tour.
The sell out tour starts on May 27 in Sunderland and the Pet Shop Boys will perform parts of their own Pandemonium show.
Jason Orange thought Neil Tennant and Chris Lowe would be too big to agree to perform the shows.
He said: "I'm flattered and very happy they've agreed to do it. They're so talented; I thought they'd be above it and us."
Williams said: "I'm a huge Pet Shop Boys fan so for me it will be an absolute joy to be able to watch them every night."
The Pet Shop Boys have sold more than 50 million records. Their hits include West End Girls, It's A Sin and Go West.
In 2009 they were given the outstanding contribution to music award at the BRITs