And it is revealed he celebrated Princess Charlotte's birth on May 2, 2015, with a £34 bottle of pink fizz.
In a post from that day he poses with a glass of fizz, writing: "A little pink champagne to celebrate!"
His friends were quick to congratulate him with one writing: "Congratulations Uncle James!"
James' profile, which has existed since July 2013 when he posted his first snap, was made public overnight.
It features pictures of Pippa Middleton but none of his sister Kate, brother-in-law Prince William, niece Princess Charlotte and nephews Princes George and Louis.
His mum and dad, Carole and Micheal Middleton, don't feature either.
However, he has been tagged in pictures by Spencer Matthews – including in a snap at his wedding to Vogue Williams.
This picture shows them both jumping in the air – with James seemingly wearing red, snake print loafers.
In a snap from 2015 he is tagged but not pictured, in a photo which then-girlfriend Donna Air posted of a pair of trousers.
James, currently dating Alizee Thevenet, follows Prince Harry's ex, Cressida Bonas and Princess Beatrice on the photo-sharing site.
James revealed he loves dogs – and his pooch Ella is a therapy dog. He said: "Proud of Ella becoming a PAT dog this year.
"Animals can provide a sense of calm, comfort, or safety and divert attention away from a stressful situation and toward one that provides pleasure."
In a picture from 2015 he poses alongside Pippa and her now-husband James Matthews.
"13hrs of pain but we made it!" he wrote. "ÖtilÖ SwimRun World Championships! Thank you for all the support for Michael Matthews Foundation."
He's competed other challenges in aid of the charity – joking on one occasion that he wouldn't shave off his beard, as previously hinted.
Michael, Spencer and James' brother, died in 1999 when descending the summit of Mount Everest and the foundation supports educational projects in Africa and Asia.
James' beard seems to be a running joke because in one snap he posts a picture of some beard conditioner which he owns.
"[I've] never felt more like a man," he wrote in a caption accompanying the snap.
In another picture he leaps in the air, captioning it: "Sunday run day."
He also has many pictures of his dogs, wishing them happy birthday on occasions.
And he dresses them up in Christmas outfits.
In a picture from Hong Kong he gives a peace sign.
He also posts childhood pictures, believed to be of him.
In one of them – thought to be taken at the Middleton household – he lies in a makeshift bathtub.
"I remember you so well like that," his pal said.
Wills and Kate, who turned 37 yesterday, now have three children together
Prince William missed part of his wife's birthday to visit the heroes behind the life-saving London Air Ambulance.
He joked he forgot her special day as he picked up a toy helicopter for son Prince George.
Apparently Harry and Meghan popped over to Kate and Wills' apartment in Kensington Palace and during the meet Meghan presented Kate with a very thoughtful gift.
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