Justin Bieber - 'What Do You Mean?' (1 Week)
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Every Big Top 40 No.1 Single Of 2015
10. Justin Bieber - 'What Do You Mean?' (1 Week)
In a weekend when both Justin Bieber AND Demi Lovato were vying for the top spot, it was Justin who reigned supreme bagging his first No.1 of 2015.