Tony Abbott's daughter, Frances Loch, has given birth to her first child with her husband Sam Loch.

The 30-year-old welcomed son Ernest Loch on July 11, with Sam announcing the birth on Instagram.

"Born on his due date, July 11 tipping the scales at an even 9lb," he wrote.

"Brought into existence by his mum with nothing but breathing, coconut water and heart."

On his Instagram story, Sam acknowledged their baby's name - Ernest - is unusual in 2021.

He shared a graph from baby name website Nameberry, which showed the sharp decline the name has had on the list of most popular boy's names since 1880.

"Not aiming for popularity," Sam wrote.

Frances announced they were expecting in January 2021.

"Big little baby Loch. Joining the party Summer '21," Frances wrote alongside a very happy photo of her holding her growing baby bump.

As the daughter of Australia's 28th Prime Minister, this isn't the first time Frances has made headlines.

Here's everything we know about Frances Loch's life in the public eye.

A 'fast' proposal.

Frances and Sam, 38, surprised everyone when they got engaged in 2017, just two weeks they first met.

Speaking to Stellar magazine that year, the fitness instructor explained she was introduced to Sam, a former Olympic rower, in mid-October after a friend suggested they would get along.

"Next thing he is standing in my lobby with a coffee," she told the publication. "As soon as I met him, I knew it was something special."

Two weeks later, Sam proposed. At the time, Frances was putting frozen peas in her freezer when Sam came up to her with a bottle of champagne in his hands.

"He said, 'Why aren't you asking me why I'm holding champagne?' So I said, 'OK... why are you holding champagne' He said, 'Well, I thought we could drink it after I asked you to marry me'."

The couple announced their engagement two weeks later.

"Everyone's like, 'Wow, this is really fast'," she told the publication. "But it feels so natural to me. His energy, it's so grounding. When I am around him, I am like, 'This is what it's meant to be like'. Life is short, and love is special, and sometimes you just need to follow your instincts."

Tony Abbott and his wife Margaret were also surprised to hear about the engagement.

"Mum was like, 'Frances, you are quite impulsive'," she said. "My family just want what’s best for me, as any family would with their daughter. They are cautious because of the time, but they know me."