The actress, who played Weatherfield's troubled Shelley Unwin between 2001 and 2006, revealed the news yesterday during an appearance on Sky1's Angela and Friends.
According to The Sun, Lindsay joked that she does not do "anything by halves" as she discussed motherhood with the programme's host Angela Griffin.
Lindsay has been in a relationship with musician Steve White for six years. White currently has two children from a previous romance.
The couple had already been making plans to marry later this year.
