See which stars have added on to their brood with the help of another
Neil Patrick Harris and David Burtka
Twice as nice! The How I Met Your Mother star and his partner became the proud dads of a son and daughter in October 2011. Harris revealed the arrival of the twins on Twitter, writing, "Gideon Scott and Harper Grace entered the Burtka-Harris fold. All of us are happy, healthy, tired, and a little pukey."