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Too Cute!Neil Patrick Harris Reveals Daughter Harper Lost Her First Tooth — See the Pic!

Neil Patrick Harris' daughter is getting so big!

The 43-year-old actor took to Instagram on Sunday, Oct. 30 to share that his six-year-old girl, Harper, lost her first tooth — and we couldn't be happier for her reaching this big milestone!

"Very exciting — Harper lost her first tooth! And she woke up to find that the Tooth Fairy had left a Lin-Manuel Miranda under her pillow! #Rich," Neil captioned the sweet snapshot.

MORE: Neil Patrick Harris Reveals How He Feels About Co-Hosting Live! With Kelly Ripa — See What He Admitted!

The Gone Girl star and his husband, actor and chef David Burtka, 41, welcomed Harper and her twin brother, Gideon, via surrogate in October 2010. The couple — who first publicly acknowledged their relationship in 2007 — married in Italy in September 2014.

Click through the gallery below to see more stars with twins!