Akon: Jackson will lip-sync

Akon has disappointed scores of fans who have splashed out on tickets for Michael Jackson's comeback concerts by insisting the King of Pop won't be singing live.

The R&B star, who has previously collaborated with the 'Thriller' hitmaker, admits Jackson won't be showing off his vocals during 'This Is It', his upcoming seven-month London residency, and will instead rely on a pre-recorded track.