Singer planning circus-themed extravaganza

Britney Spears is thought to have asked her ex Justin Timberlake to perform on her US tour.

She wants Pharrell Williams, 35, and pal Madonna, 50, to make an appearance too, according to reports.

The singer, 27, will kick off the UK leg of her Circus-themed tour in the summer.

And she is said to have asked Sir Elton John, 61, to join her on stage.

She hopes to stay in London for four months ahead of her gigs at The O2 arena in June.

‘It will be amazing,’ a source tells the News Of The World. ‘Britney can’t wait to move to London. She thinks she’ll have more freedom.’

Britney‘s album Circus is out now.

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Alison Adey