Modern science and teamwork played a big role in creating Neil Patrick Harris's twins, son Gideon and daughter Harper, born in 2010. It involved an anonymous egg donor, two embryos – one each for Harris and partner David Burtka – and a surrogate. "We really, really wanted kids," the How I Met Your Mother star revealed to Oprah Winfrey last year. "We really had thought it through financially, emotionally, relationship-wise. These kids [came] into our world with nothing but love."