He was reportedly there to play a prank on Rupert Grint.
As The Post's Page Six notes, Rupert Grint is currently starring in the Broadway play It's Only a Play, alongside Matthew Broderick, Nathan Lane and Stockard Channing. From what the site reports, it sounds like Grint is the most popular of those stars, at least among the fans who linger out by the stage door in the hopes of getting an autograph, a selfie or at the very least, a peek at stars.
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