The always wonderful Neil Patrick Harris sat down with David Letterman on "The Late Show" Monday night -- and brought with him a special treat for those looking forward to the 2013 Tony Awards this weekend.

Well, sort of.

Watch the "How I Met Your Mother" star chat with Dave and reveal a special, "secret" clip of his rehearsal for Sunday night's big opening number in the video above. Trust us, you'll be blown away.

The Tonys will air on CBS on Sunday, June 9, live from Radio City Music Hall in New York City.