The 40-year-old described herself as feeling "so very blessed" as she revealed her newborn has been called Pierre in a post on Snapchat on Tuesday.

"We are overjoyed by the arrival of our little ray of sunshine, Pierre Kerr Spiegel," she said.

"We couldn't be more excited to welcome our fourth son into our family. Feeling so very blessed."

The message sat at the top of an image of flowers, baby socks and what looked to be a piece of clothing with the name Pierre embroidered on it.

Kerr, who is married to Snapchat chief executive Evan Spiegel, had announced her fourth pregnancy in September.

The Australian gave birth to her first son Flynn in 2011, whom she shares with ex-husband Orlando Bloom.

She was married to the Pirates Of The Caribbean star, who now shares a child with his partner Katy Perry, from 2010 to 2013.

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The model tied the knot with Spiegel in May 2017 after announcing their engagement on social media in July 2016, having dated since 2015 after meeting at a dinner in New York the year before.

In 2018 they welcomed their first child together, a boy called Hart, and in 2019 their son Myles was born.