Singer Cheryl announced that she has given birth to her first child with One Direction star Liam Payne.
The former X Factor judge said they had welcomed the baby boy on Wednesday and are "overwhelmingly happy".
She posted an image on Instagram showing Payne cradling their newborn.
Cheryl added the pair are still considering baby names.
Payne also shared the photo, saving the birth of his son was his best ever memory.
He wrote: "My close friends and family know there are very few times when I'm left speechless...wow!
"I'm incredibly happy to welcome our new baby boy into the world, it's a moment that I will never forget for the rest of my life and my favourite memory I have so far."
Payne said he was "in awe" of how well Cheryl had dealt with the pregnancy, adding: "She's really made my dreams come true".
"We haven't named him yet but he's already capturing hearts including mine. I feel very blessed," he wrote.
"Happy Mother's Day everyone!"
Cheryl's former Girls Aloud bandmate Nadine Coyle offered her congratulations on the new arrival.
The couple's announcements on the birth is the first time that either have directly spoken about their baby.
Cheryl had tacitly acknowledged her pregnancy with a campaign photo for a Princes Trust campaign but had never confirmed any details.