Jamie Oliver's wife Jools has given birth to a baby girl named Petal Blossom Rainbow.
The couple already have two daughters with floral-themed names - Poppy Honey, seven, and Daisy Boo, five.
The new arrival at the Portland Hospital in London weighed in at 6lb 10oz.
A statement from the couple said: "Both she and Jools are doing well.
"The Olivers would like to thank midwives Linda Ordish and Elaine Porter and also obstetrician William Dennis for their wonderful help and support."
"Jamie and Jools are both completely smitten with Petal already and Jamie is looking forward to two weeks paternity leave to spend quality time with his four beautiful girls."
The celebrity chef cooked for the G20 leaders on Wednesday - the day his wife was expected to give birth.
Downing Street officials were poised to keep him informed if Jools had gone into labour.
The chef described cooking for the event as "a pretty cool gig" on his online diary