Neil Patrick Harris [1] and David Burtka may have only tied the knot in 2014 [2], but their romance has been burning bright for well over a decade. Over the years, we've been treated to tons of adorable family snaps [3] featuring their twins, Harper and Gideon, plus a few moments of sweet PDA [4]. And all the while, we've witnessed plenty of other sweet moments on Instagram, Twitter, and the red carpet.