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Published 16:25 7 May 2015 BST
Updated 13:28 11 Jun 2015 BST

"Simon [Cowell's] management phoned to see when Demi could sign her contract about a week ago. They both have busy schedules but she is planning to do it as soon as possible and Simon is eager to get the judging panel sorted," a source told The Daily Mirror.
The Skyscraper singer already has a few friends on set, having recently released hit single Up with new host Olly Murs.
Murs and Caroline Flack will take over from old favourite Dermot O'Leary, following his exit from the show last month.
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