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OTRC: Neil Patrick Harris showcases twins' funny costumes on 'Letterman' (Video)

Neil Patrick Harris appears on 'The Late Show with David Letterman' on June 9. / Neil Patrick Harris' twins are shown in a photo showcased on 'The Late Show with David Letterman' on June 9. (CBS / Worldwide Pants)

Neil Patrick Harris, star of the comedy series "How I Met Your Mother," recently joked about his and partner David Burtka's love of dressing up their twin son and daughter in colorful, funny costumes during holidays.

"We do one a month," Harris, 37, said on "The Late Show with David Letterman" on Thursday, June 9. We're doing a calendar, so that when they're older, we can humiliate them and embarrass them."

In the twin's May photo, which Harris showed on the program, baby Gideon is seen in a tiny sombrero holding hands with Harper, who is sporting a thick unibrow, channeling Mexican painter Frida Kahlo, who was made even more famous via the 2002 film "Frida" that earned Salma Hayek an Oscar nomination.

"We couldn't figure out what holiday to do for May so we went Cinco de Mayo," Harris said.

Other photos show the twins dressed as leprechauns for St. Patrick's Day and as bunnies for Easter.

The twins were born via a surrogate mother on October 12, 2010. They are Harris' first children.

Harris, who rose to fame as a teen star, playing a doctor on "Doogie Howser, M.D.," is preparing to host the 2011 Tony Awards ceremony, which airs live from the Beacon Theatre in New York on CBS on Sunday, June 12, 2011 at 8 p.m. ET.

The actor last hosted the ceremony in 2009 and earned a Creative Arts Emmy Award, along with executive producers Ricky Kirshner and Glenn Weiss, for his work on that broadcast.

Harris was back on stage in April in the New York Philharmonic's production of "Company," where he joined Stephen Colbert, Christina Hendricks and Patti LuPone.

The musical "The Book of Mormon," from "South Park" creators Trey Parker and Matt Stone, earned a whopping 14 nominations, including Best Musical, while "The Scottsboro Boys," also garnered a nod in that category, marking a total of 12 nominations. "Sister Act," the musical based on the films that starred Whoopi Goldberg, which is also co-produced by the actress and "View" host, earned five Tony nods.

Notably missing from the list is "Harry Potter" actor Daniel Radcliffe, who in March made his Broadway musical debut in the revival of the 1962 show "How to Succeed in Business Without Really Trying."

Check out the full list of 2011 Tony nominations here.

Check out a video of Neil Patrick Harris' interview on "The Late Show With David Letterman" below.

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