The celebrity chef and dad-of-four shared a photo of Jools Oliver, 41, in their ready-to-go nursery, two weeks before her due date.
“Back home now from Brazil, so nice to see the kids and @joolsoliver,” he wrote.
“Two weeks to go... Nervous but very excited. Big love Jamie O x X X.”
The Olivers are already parents to Poppy, 14, Daisy, 12, Petal, six, and Buddy, five.
The couple announced Jools’ pregnancy in March 2016 during the ‘Eddie The Eagle’ film premiere in London.
The celebrity chef, 40, said this baby will be their “last one”, admitting he was shocked when he found out they were expecting.
“It is just getting ridiculous otherwise,” he joked to The Sun on the red carpet.
“This was not expected. I can’t even believe I’m saying it. My own family were shocked too.”
Since the news was announced, the couple haven’t shared whether they’re expecting a boy or girl - or whether they even know themselves.
Fans have been guessing though, since Jools shared photos of herself doing the “pendulum swing test” and her first bump photo on Instagram.
They claimed, because her bump was “high up and pointing forward”, it was a boy.
Only time will tell.