Neil Patrick Harris dishes about his wedding day

George Clooney isn't the only celebrity to get married in Italy this month. Neil Patrick Harris wed actor David Burtka on Sept. 6, and offered up the details on the "Late Show with David Letterman" Monday night:

The former "How I Met Your Mother" star said the 50-person wedding took place in a castle near the city of Perugia. Elton John played a few songs and, according to Harris, introduced their couple's first dance: Kelly Clarkson's "A Moment Like This."

Harris arranged for fireworks to explode during the song's peak and, to his surprise, the timing was perfect.

Harris and Burtka have been together for 10 years and announced the wedding in 2011. Earlier this month, the actor tweeted about the event:

Congrats Neil and David!

NPH will be appearing next in David Fincher's "Gone Girl," which also stars Ben Affleck. The film opens Oct. 3.