James Corden interviews the very cute TNT Boys to hear all about their time on 'The World's Best' and he hints at their love of Ariana Grande.
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He then asks the very talented boys to perform "And I Am Telling You I'm Not Going." The performance is incredible, but the star moment is when Ariana Grande comes from the side of the stage to surprise the boys. To watch the priceless reaction watch the video above.