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Neil Patrick Harris Shares Cute New Photos of Twins Harper and Gideon — See How Grown Up They Are!

Harper and Gideon aren't so little anymore!

Neil Patrick Harris posted a new Instagram photo on Sunday, June 12 of his five-year-old twins playing on a playground — and we can't get over how big Harper and Gideon look in the new side-by-side pic!

"Harper and Gideon graduated from the amazing Weekday School on Friday. Now they're just monkeying around. #NextStopKindergarten," the 42-year-old actor captioned the snapshots.

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Neil and his husband, David Burtka, 41 — who married in 2014 — welcomed Harper and Gideon via surrogate in October 2010.

Click through the gallery below to see more of Hollywood’s cutest kids!