The petite Panettiere, 24, first shared her desire to start a family with Klitschko, a 38-year-old boxer, during a May 2013 interview with Glamour magazine.
"I've lived a very big life, and I don't feel my age, and I feel like I was born to be a mother," she said. "Sometimes people speak about [having kids] like, 'Your life ends—you're never going to be able to do anything again!' And I'm like, 'What are you talking about?' Motherhood is the most beautiful, exciting thing, and there's nothing that I feel like I can't accomplish while having children in my life."
This will be the first child for both Panettiere and Klitschko, who met at a book party in 2009 and have been engaged for a year.