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A healthy amount of skepticism is a good thing. But actually, answering your questions (which the user did above) is pretty easy--it's far too easy to type a recognizable celebrity's name onto a screen and have it projected within a matter of seconds if a secondary camera sees him walking on stage. Beyonce is a huge celebrity and one of the main nominees for the ceremony, so they would have had her on camera anyway. I'm more bemused by the fact that you dismissed a valid response with the assertion of your original hypothesis and the fact that a user used "of" instead of "have." Other aspects of the post, such as his ability to identify the technological system used, should have indicated, despite the inability to perfectly articulate his point, that he may know what he's talking about.
