As they joyfully revealed on hellomagazine.com, the couple are expecting a sibling for their four-year-old Alastair.
But until now, the long and emotional struggle they had to fulfil their dream of having another child has remained under wraps.
In a HELLO! exclusive this week, the couple open up about the gruelling series of IVF treatment they resorted to and the subterfuge they went through to keep her pregnancy secret until the 12-week mark.
Thankfully, all is well now. Radiant Penny, 39, is just showing the beginnings of a baby bump and Alastair is thrilled - above all because doctors are 99 per cent certain it's a boy.
"It's exactly what he wanted and his happiness made all the IVF treatments worthwhile," says his mum.
Issue number 1149 contains the interview and 18 pages of gorgeous photos.
Pick up your copy now for the full story.