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A hologram played 'Letterman' this week
Hatsune Miku played the "Late Show with David Letterman" on Oct. 8.
Miku is a Japanese pop star. She is also a hologram.
If the blue-haired, waifish "vocaloid" singer looks familiar to you, she opened for Lady Gaga during her ARTPOP tour dates for a month ealier this year.
Watch the video, nod your head knowingly but unknowing, wait for Letterman's reaction at the end.