"Both Lee and her baby are healthy," the agency, Namoo Actors, said.
"I'm happy to have a new family member. Thank you for praying for me and a healthy baby. I will do my best to have a happy family," she was quoted as saying.
The 31-year-old Lee, who is known for her role in the KBS2 hit drama “Wang Family,” married a dentist, who is three years older than her, in September last year.