If you've ever wondered what Neil Patrick Harris' kids would look like if they were, say, leprechauns, then you've come to the right place.

During an appearance on the Late Show With David Letterman last night, the How I Met Your Mother star was more than happy to share pictures of his and partner David Burtka's 7-month-old twins, Gideon and Harper, dressed up in various costumes to reflect different holidays.

"We do one a month," explained Harris. "We're doing a calendar, so when they're older, we can humiliate them and embarrass them."

As a result, we get a glimpse of both rugrats in their St. Patrick's Day best (complete with "green beer"!), sporting Easter-themed bunny ears and, for Cinco de Mayo, well, let's just say you don't want to miss seeing Harper's Frida Kahlo-inspired unibrow!

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