Jamie and Jools Oliver have called their newborn son River Rocket.

Jamie and Jools - who already have daughters Poppy Honey Rosie, 14, Daisy Boo Pamela, 12, Petal Blossom Rainbow, six, and five-year-old son Buddy Bear Maurice - welcomed their fifth child two weeks ago.

Jamie shared a picture of the baby and wrote: "And then this just happened guys !! IT'S A BABY BOY !! Everyone in the Oliver family is very surprised and beyond happy. He arrived safely, mum / @joolsoliver was really really amazing, unbelievably composed, natural birth and my two eldest Girls got to come in at the very end as the baby was born which was amazing to witness very very emotional. 8 lbs ( that's 16 packs of butter for you bakers out there) anyway were all hitting the hay it's been a long day big love... bless a little baby boy Woop Woop !!!! And love to all you mums out there how amazing you are it blows my mind .... Big love jamie o p.s no baby names yet (sic)."

Jools also took to Instagram to share a picture of herself breastfeeding the baby and wrote: "Little baby boy Oliver has arrived we are so very happy, blessed, grateful and totally in love all over again and so very proud of our two eldest daughters who cut the cord Jamie was my hero (no name yet)!!! XXXX (sic)."

Jamie, 41, recently revealed that he was hoping for another son.

He said: "I thought we'd have a couple of kids but that's about it.

Basically, I do what I'm told, but she's an amazing family maker and I just go with it. A bit more testosterone would probably be a good thing, but do you know what, I'm just grateful for whatever I get if it's healthy."