Published Tuesday, 19 March 2013
The Phantom of the Opera star, who has a three-year-old son named Bobby with her husband Robbie Tickle, was unaware she is expecting again when she was given the shock news.
Now Ellison has nicknamed the tot her "miracle baby", since medics had told her she was unlikely to fall pregnant again due to cysts on her ovaries.
She tells Now magazine: "I didn't even know I was pregnant until four weeks ago, and I'm almost five months now. I can't believe I'm having another baby in July - it's been a massive shock.
"We'd both just come to terms with the fact that we probably weren't going to be having another baby any time soon - and now we're getting ready to do it all over again."