The 70-year-old star is said to be delighted with the news, reported Daily mirror.
"It is true. I am going to be a grandmother. I think making Mick a grandfather obviously had a big impact whereas, now making him a great-grandfather is no longer particularly fascinating," Jade said.
Mick reportedly has no qualms about becoming a great grandfather.
"Jade was a little taken aback at first, not least because it means she will be a grandmother by the age of 42. Mick is delighted and has no qualms about being a great grandfather. He's been joking about becoming a great, great granddad and still performing!," a source said.