Olivia Culpo has given birth to a baby girl

Alongside a photo of her daughter's tiny hand, Olivia wrote on Instagram: "Colette Annalise McCaffrey [heart emoji] (sic)"

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

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

The brunette beauty wrote on the photo-sharing platform: "Colette is so lucky to have the best daddy in the world. A love like no other."

Olivia actually described childbirth as the "scariest and most rewarding of all experiences".

The model - who previously dated Nick Jonas - added: "As soon as [Christian] came into the room, I felt most at peace."

Olivia previously admitted that her pregnancy proved just how much she needs her own mother.

The model - who announced her pregnancy in March - explained that her mom has been hugely supportive of her over recent months.

Olivia - who won the Miss Universe beauty pageant back in 2012 - told People: "I feel like I have a lot of respect for my mom and one thing that I realised through this experience of becoming a mom is actually how much I've needed my mom, which I didn't anticipate.

"She's just been so helpful to me, especially in the beginning of my pregnancy. That was really tough. It's just kind of an interesting thing, and I'm just so grateful to her.

"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."

The loved-up couple did "a lot of research" ahead of welcoming their baby.

Despite this, Christian acknowledged that "everybody's experience is different".

The San Francisco 49ers star shared: "A lot of research, a lot of questions to parents, but one thing I've realised is everybody's experience is different.

"I think it's one of those things that you just have to go through, do the best you can with the information that you have."