Justin Bieber is only a few weeks away from launching his “Believe” world tour.

Thursday night, Bieber was on hand for the finale of America’s Got Talent, where he joined a host of other acts to perform, including Green Day, Ne-Yo and Blue Man Group.

Justin and guest Big Sean teamed up on his latest single, “As Long As You Love Me,” which had the audience screaming at fever pitch.

Bieber opens his “Believe” tour in Glendale, AZ on September 29.


Justin Bieber





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