The celebrity chef, 41, used the designer's account to share a snap of her snoozing next to their new baby boy, who arrived on August 8.

He wrote: "Hacked mums Instagram account.

"Bless them both sleeping and exhausted together. I can't tell you what a wicked mum this chick is.... I had the best week off readjusting to the new family member a baby boy and I've loved every single minute....everyone has grown and adjusted...

"Big love to all the mums out there it's hard graft amazing.

"Happy weekend people and when Jools finds out I hacked her account all I can say is I love you joxxxxxxx."

The baby joins siblings Poppy Honey, 14, Daisy Boo, 12, Petal Blossom, seven, and Buddy Bear, five.

The Olivers have yet to reveal the name of their latest arrival.

They previously hinted that their fifth baby would, like his brothers and sisters, have an unusual moniker, with the couple likely to go for something "floral" or "seasonal".