The 55-year-old Frenchman already has two sons with his 40-year-old fiancée Michelle Kennedy - Jean, seven, and Jacques, three. Jean-Christophe also has a 30-year-old daughter, Christina, from a previous marriage.
The former Hell's Kitchen star revealed the exciting baby news in the new issue of Hello! magazine, and was quick to blast those who believe he's too old to become a father again.
'When the new baby is 20, I will be 75, but I don't see it that way. Age is just a number at the end of the day', he told the magazine.
Jean-Christope and Michelle with son Jean in 2009
'If I compare myself to a good wine or a cheese, it's very true that the older you get, the better you are.
'I have always loved the idea of having three boys. I don't know why, it's what I've always wanted.'
Famille selfie! Joyeux dimanche! X pic.twitter.com/KPiw2312ZN— Jean-Christophe (@jc_novelli) August 9, 2015
During the interview and photoshoot, which took place at the family's holiday home in the Austrian Alps, Jean-Christophe also revealed details of the family's health regime.
'I lead a much healthier life now. We are very active and I go for a run with my son Jean every morning. Michelle and I don't smoke, we don't drink and we do a lot of sport. There is a lot of happiness, which I think is essential in life.'
Happiness is... pic.twitter.com/2Oh94npEz8— Jean-Christophe (@jc_novelli) December 10, 2014
The chef's fiancée Michelle said that her hubby-to-be was thrilled at the news of the surprise pregnancy.
'I didn't tell Jean for a couple of days,' she said.
'I was trying to get my head around it. When I did eventually tell him, he jumped up in the air, singing and dancing.
'He's over the moon and the kids are really excited too.'
Michelle, who's originally from Luton, first met the chef when she was doing promotional work at Luton Airport and he was catching a plane. They've been together for 11 years.