Hayden Panettiere and her fiance Wladimir Klitschko are thought to be expecting their first child.
Us Weekly reported that the actress, who has been engaged to boxer Wladimir for a year, is pregnant.
Former Heroes star Hayden, 24, and Wladimir, 38, dated on and off for two years before splitting in 2011, but got back together early in 2013 and were soon engaged.
Hayden has previously told Glamour magazine that she was "born to be a mother", adding: "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."
She also told The Ellen DeGeneres Show of potential children with 6ft 6in Wladimir: "He's got bowlegs and I've got knocked knees, so they're going to have straight legs. And they'll be normal height."
The actress had her big break starring as invincible cheerleader Claire Bennet in Heroes in 2006 and later told how she feared her career could have been over when the show was axed in 2010.
Hayden went on to star as scheming country music star Juliette Barnes in hit ABC show Nashville.