Jamie Oliver has revealed the name of his new baby son – River Rocket Oliver.

The celebrity chef posted a picture on Instagram of his fifth child snoozing in the garden, as he formally introduced him to the world.

He wrote: “Ow what a Hot Day today guys. So the littlest one is stared out and sleeping again….. it’s probably polite to formally introduce the new boy to you, his names River Rocket Oliver we think it suits him and he’s a little gift and we are all very happy….

“Thanks for all your kind wishes big love jamie and gang X X X.”

The family had kept quiet about their son’s name since he arrived on August 8.

However, Jamie’s wife Jools recently dropped a big hint when she posted an Instagram message reading “Dream Big River” in capitals. She added an emoji of a rocket and another of a heart.

It triggered speculation that the couple’s new arrival was called River or Rocket.

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