The children's lovely photos were released a day after their celebrity chef father and wife Tana announced the arrival of their fifth child.
"After 3 baftas and one Emmy. finally we have won an Oscar", Gordon wrote in his post. "Xxx", he captioned the pic.
Their children - Megan, Matilda and twins Jack and Holly - all sent their well wishes, before Tana did the same.
The couple announced the news of their pregnancy in January via a sweet family video.
The celebrity chef and his wife Tana heartbreakingly suffered a miscarriage in 2016.
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In the modern age of social media and self-promotion, Baby Oscar is learning quick - the tot already has his own Instagram account set up which has already amassed over 6,000 followers.
On Thursday morning, the celebrity chef and Hell's Kitchen star shared some big family news on Instagram.
And Gordon's son Jack particularly loves it in the westcountry as he is now living in Exeter as a student at Exeter University.
Then the camera slipped down to reveal Tana's blossoming baby bump.
Days before Tana gave birth, the 52-year-old even posted a throwback photo of his family, with the kids looking considerably younger, saying "Just days away from our new addition to the Ramsay Family. they grow up quickly". "Happy new year from all the Ramsay's [sic]".
This story originally appeared on The Sun and is republished here with full permission.