Olivia Culpo welcomes a baby girl

Alongside a photo of her daughter's tiny hand, Olivia wrote on Instagram: "Colette Annalise McCaffrey".

McCaffrey, 29, also shared the same post on his own social media account.

Culpo has already hailed the sports star as the "best daddy in the world".

"Colette is so lucky to have the best daddy in the world. A love like no other," the former Miss Universe wrote.

Culpo described childbirth as the "scariest and most rewarding of all experiences" and said her mother had been hugely supportive of her over recent months.

"It's just an ironic thought that you need your mom the most when you're about to become a mom. That's just genuinely how I felt," she told People