Olivia Culpo has given birth to a baby girl.

The 33-year-old model has announced she and NFL San Francisco 49ers star husband Christian McCaffrey have welcomed their first child.

Alongside a photo of her daughter’s tiny hand, Olivia wrote on Instagram: “Colette Annalise McCaffrey”.

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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” in another post on Instagram.

The model was a former Miss Universe winner, capturing the coveted title in 2012.

Culpo and McCaffrey began dating in 2019 and were married in 2024.

McCaffrey, 29, is one of the NFL’s biggest stars.

The running back was a first-round pick in 2017 and has racked up big numbers since entering the league.

He dominated for five season at the Carolina Panthers before joining the San Francisco 49ers in a blockbuster trade.

The running back won the NFL offensive player of the year award in 2023 when he racked up over 2000 yards and scored 21 touchdowns.

On the eve of last season, McCaffrey signed a new deal worth US$38m (A$58m) through to the end of 2027, which made him the highest-paid running back in the league.

But his 2024 season was ruined by a series of injuries that restricted him to just four matches.