Jamie Oliver's wife Jools hints at having fifth baby

has hinted that she

with her celebrity chef husband

. The 40-year-old, who is already a

says that she would be fully prepared if she found herself expecting again.

she said in an interview with

.

Jools and Jamie already have four children together

Jools, whose Twitter biography simply describes her as "a mum", has made no secret of her desire to have another child,In 2012, she told

magazine:

she said. "But I know it would be wrong. I never get any time to spend with Jamie as it is. He has said give it a couple of years, then maybe we can think about it."

The couple first met in 1993

Jamie, who rose to fame in 1999 at the age of 24, has also mentioned his wife's plans to expand their family."I took her out and she goes, 'OK are we going to have another kid then?' I said, “You what?'" he said. "

But with all the power in my body we are not having another baby."Jamie and Jools, who

after dating for seven years, are parents to daughters

, 12,

, 11,

, five, and four-year-old son

.