Harry and Meghan have coped backlash over this Instagram photo

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Prince Harry and Meghan Markle have come under fire after posting a birthday message to Prince Louis.

The youngest son of Prince William and Kate Middleton celebrated his first birthday on April 23, and the Palace marked the special occasion by sharing a series of sweet snaps of Louis taken by mum Kate.

kensingtonroyal View Profile

Harry and Meghan responded to the post from their respective page, Sussex Royal, wishing their nephew the best.

"Happy birthday Louis! Sending lots of love from both of us xo."

But fans were less than impressed with how the Harry and Meghan referred to their tiny royal relative and hit back at the couple for failing to use the Prince's official title.

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Just one week ago, The Duke and Duchess of Sussex asked that you kindly consider supporting various organisations around the world in lieu of sending gifts for the upcoming arrival of their first born. Not only did many of you lend your support, you took action. Their Royal Highnesses wanted you to know the impact of your support - the direct effect your donation, energy, and action made! YOU chose to be part of the collective good, and you have made a real difference. Whether a $5 donation, £1000 contribution, offering to volunteer, or spreading the word - you've played your part. And on behalf of The Duke and Duchess (and Baby Sussex), we thank you so much. YOUR IMPACT: @thelunchboxfund will now be able to provide a minimum of 100,000 additional hot nutritionally fortified meals to children in dire need across South Africa @littlevillagehq received donations from all over the world (from UAE to Hong Kong and the US), they've increased their monthly donors, had a surge in volunteer applications, and re-energized their hard working team of 200+ staff and volunteers @wellchild can now provide 300+ additional hours of specialist care by a Well Child Nurse for a child with serious health needs, allowing families to stay together at home vs in hospital @Baby2Baby have received over 5,000 products to disperse to children in need, including cribs, books, backpacks, diapers and have received monetary donations from around the globe - from Guadalajara to Italy. You made this happen. Thank you.

"@sussexroyal if you don't believe in titles that's fair enough, but then don't expect people to use yours to address you," one user wrote, per Express.co.uk.

Another said: "It's PRINCE Louis to you. He outranks you both!"

Prince Louis is fifth in line to the throne, after his grandfather Prince Charles, dad William, brother Prince George and sister Princess Charlotte.

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Katherine Davison

Katherine is the Executive Editor (News & Features) for New Idea and WHO, and a real-life specialist with 17 years of experience in Australia and the UK.

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Harry and Meghan have coped backlash over THIS Instagram photo