The 25-year-old Nashville star and her fiancé Wladimir Klitschko welcomed a baby girl Tuesday, according to People, which reported that she weighed 7 lbs., 14 oz., and measured 20 inches.
Hayden and Wladimir named their baby girl Kaya, telling the mag, "We are over the moon and madly in love."
Although there was much speculation, the actress first confirmed that she was expecting a baby in August, when she palmed her bump in a silvery, beaded Lorena Sarbu gown. Hayden also accidentally let it slip that she was pregnant with a girl.
"I can't wait for her to come out," Hayden said during an interview with E! News host Giuliana Rancic. "Is it a girl?! Giuliana replied. "Yes, it's a little girl. I have to shop," Hayden said.
As for how they chose the name, Hayden said at the time that they wanted to make sure that the baby's moniker was "American and Ukrainian all at the same time."