Robbie Williams has snubbed the Take That comeback tour - to perform with the Pet Shop Boys.The 'Angels' singer - who was set to join his old band mates for at least one of their forthcoming shows - has backed out saying he's too busy.The 36-year-old star has reportedly been spending time recording a dance album with the Pet Shop Boys - and is said to be planning to join the chart veterans for a secret concert in London.A source told Britain's News of the World newspaper: "Initially Robbie wanted to join the Take That boys on the tour - he was quite excited about seeing his fans again."But time just wouldn't allow it because he has too much going on at the moment. However, when the Pet Shop Boys came along and asked him to join them for their one-off gig, he jumped at the chance."Robbie was recently reported to be recording a "Kylie style" dance album- to please his gay fans.The 'Let Me Entertain You' singer has reportedly hooked up with Madonna's former producer William Orbit for the project.

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