Robbie Williams and Ayda Field have welcomed a son via surrogate.
The pop star, 46, and his wife confirmed the news tonight, revealing they are new parents to a baby boy.
The tot was born via the same "incredible" surrogate mother who gave birth to their daughter Coco.
They have named him Beau Benedict Enthoven Williams.
Ayda, 40, shared the news with fans by posting a picture of the family's feet - with an additional pair belonging to their new baby boy.
She wrote in a post on Instagram: "Spot the difference...' On this Valentine's Day, we would like to celebrate love in the most awesome way... Beau Benedict Enthoven Williams.
"As with Coco, he is biologically ours, but born via our same incredible surrogate. We are so blessed to have our healthy son safely in our arms and are officially complete as a family.
"#happyvalentinesday #surprise #familyof6 #whodathunkitinthe90s The Williams Family xx."
Robbie and Ayda's announcement comes 17 months after they revealed they'd welcomed their third child Colette Josephine Williams - known as Coco - via a surrogate.
The couple, who married a decade ago, are also parents to daughter Theodora Rose Williams, seven, and son Charlton Valentine Williams, five.
Ayda has previously spoken about the couple's heartbreaking struggles to conceive.
She opened up as she confirmed daughter Coco had been born via surrogate.
In a previous post on Instagram, she wrote: "So we have been keeping a very special secret.
"We are delighted to share with you that we have had a baby girl…. welcome to the world Colette (Coco) Josephine Williams!!
"It has been a very long and difficult path to get here, which is why we have kept it on the down low.
"Family comes in all forms, and this little lady, who is biologically ours, was carried by an incredible surrogate mother, to whom we will be eternally grateful."