Jamie Oliver and wife Jools have welcomed baby No. 5.
"It's a baby boy! Everyone in the Oliver family is very surprised and beyond happy," he wrote.
"He arrived safely, mum/@joolsoliver was really really amazing, unbelievably composed."
Oliver and Jools, who married in 2000, are already parents to 14-year-old Poppy, 13-year-old Daisy, 7-year-old Petal and 5-year-old Buddy.
Poppy and Daisy joined their parents in the delivery room for their sibling's birth."My two eldest girls got to come in at the very end as the baby was born which was very emotional," Oliver said.
"Love to all you mums out there how amazing you are it blows my mind ... p.s. no baby names yet."
Many were shocked by the couple's decision to include their children, but Jacque Gerrard, the Royal College of Midwives director in England, told the Guardian it is increasingly normal.
"Birth is a family event, and it affects everyone," he said. "With the right support and preparation, why shouldn't they be involved?"
Oliver is known for such shows as "The Naked Chef," "Jamie at Home" and "Jamie Oliver's Food Revolution."
He has also appeared on "Iron Chef America" and "Oprah's Big Give."
