The 2000 Sydney Games gold medallist, 45, showed-off her latest pregnancy picture on social media revealing the news.
Former heptathlon star Lewis already has three kids with husband Steve Finan O'Connor – the former manager of pop group All Saints.
Lewis is proud mum to Lauren, 16, and sons Ryan, 12, and Kane, nine.
Taking to Twitter to share a picture of herself in a swimsuit, Lewis wrote: "Well Twitter friends, I haven't let myself go I'm eating for two.
"Excited and a little nervous even though I have been here before, but hoping for a healthy and trouble free pregnancy.#number4 #oldermom #babynews".
Just last year, Lewis revealed having kids had a huge impact on her fitness regime.
She revealed: "I can't do it like I used to because my children come first and I have to prioritise their needs.
"You can make games up together, things to get your heart rate up.
Source: Read Full Article