"So, get this: David and I are expecting twins this fall," Harris tweeted on Saturday. "We're super excited/nervous/thrilled. Hoping the press can respect our privacy..."
Harris and Burtka are using a surrogate, according to E! Online, which first reported the news. The couple has been together for six years.
Harris is also nominated for best supporting actor in a comedy for How I Met Your Mother and best guest actor in a comedy for his appearance on Glee.