News Neil Patrick Harris and David Burtka's Twins Turn Four By Rosalyn Oshmyansky 1:30 PM PDT, October 13, 2014 Instagram First Blue Ivy being adorable and now pics of Gideon and Harper playing magicians? These tots are just too cute.Yesterday, actor Neil Patrick Harris and his husband David Burtka celebrated the fourth birthday of their twins, Gideon and Harper, by sharing the absolute cutest pictures.Following their magician dad's (seriously, NPH is a legitimate magician by trade!) footsteps, they became magicians for their special day.Loading One of the kids' birthday presents was a magic set! GAH! Like father, like twins. View on Instagram NPH, 41, also shared this tweet saying, "I can't believer [sic] that you used to be tiny baby things. And now, this."Burtka, 39, also could not believe how old the twins are in this very Carrie Bradshaw-esque pic.Today is an exciting day!! Our twins turn 4! I can not believe how old they are! #solucky#happybirthday! pic.twitter.com/U3BpAAi7Gc— David Burtka (@Davidburtka) October 12, 2014Neil and David have been together for 10 years. The two married in Italy this past September. On September 8, the former How I Met Your Mother star said they "put the 'n' and 'd' in husband." NEWS: Neil Patrick Harris and David Burtka Share Beautiful Wedding PhotosNow it looks like Gideon and Harper are putting the 'g' and 'h' in delightful!If you haven’t seen the movie Gone Girl yet, you'll be happy to know that NPH plays a part in it. Watch this creepy tease below.