EXCLUSIVE: Usher is desperately trying to convince Justin Bieber to join him for the Super Bowl halftime show - but popstar is reluctant to return to the stage and wants to focus on his health after Ramsay Hunt Syndrome scare

While Usher has 'most of his ideas ready' for the monumental headline set, an insider told DailyMail.com that he's keen to get his former mentee Justin involved for a collaboration.

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