Neil Patrick Harris' How I Met Your Mother co-star Alyson Hannigan says he and partner David Burtka will make great dads.

“Without a doubt they will be wonderful dads who are going to love their little babies so much,” the 36-year-old mother of 1-year-old daughter Satyana told “Those are going to be two lucky babies.”

“I'm excited for their journey,” she added.

The openly gay Harris tweeted the good news to his nearly 1 million followers on Friday: “Babies!! On 10/12, Gideon Scott and Harper Grace entered the Burtka-Harris fold.”

“All of us are happy, healthy, tired, and a little pukey,” he added.

And updated followers on Sunday morning: “Youngsters. They cry a lot. I thought it was just a long bit that they were doing. I keep saying, 'Annnnd, scene!' … but nothing happens.”

Harris and celebrity chef Burtka entered a domestic partnership in 2004.

The 37-year-old actor won an Emmy Award this year for a guest spot on Fox's musical-comedy hit Glee and shared another for hosting the Tony Awards.