Justin was earlier this month with "The Tonight Show", which had already arranged things that were going to make that program and not.
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Bieber was to promote her single What Do You Mean, but must participate in a fun skit with Jimmy, which made all the guests. One of the things that Fallon is also angered that he warned in his 29.9 million Twitter followers that something special was going to happen.
Therefore, in an interview on tv driver he went to hit him with everything and he did not think a professional attitude. It was based on a lot of people were involved to make this happen and they canceled that day, with little time, ruined the work of many.