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'I'm Already Crying:' The Cutest Back-to-School Pics of Celeb Kids

People Logo By Andrea Wurzburger of People | Slide 2 of 50: Harris's caption on the pair's pic says it all: "First day of third grade?!? How did it...... when did they..... what in the...... #timeflies #stooppic#proudpapa"

Neil Patrick Harris & David Burtka's Twins: Harper & Gideon

Harris's caption on the pair's pic says it all: "First day of third grade?!? How did it...... when did they..... what in the...... #timeflies #stooppic#proudpapa"
© Chrissy Teigen/Instagram

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