Meghan Markle's nickname was visible during her message paying tribute to Prince Harry and her family.
The Duchess of Sussex celebrated her 44th birthday on Monday with her family in California.
On Tuesday evening, Meghan took to Instagram to share pictures from a celebratory meal marking the occasion.
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The Duchess of Sussex paid tribute to Prince Harry for his role in "a beautiful 24 hours".
Meghan Markle's nickname was visible during her message paying tribute to Prince Harry and her family.
|The picture Meghan shared on Instagram showed her blowing out a candle on a birthday cake that had been decorated with flowers.
Royals fans rushed to point out that the flowers were depicting the nickname Meghan's mother, Doria Ragland, has for her daughter.
One fan wrote: "Notice the birthday cake represents her nickname 'Flower,' which was given to her by her mother."
Other Duchess of Sussex followers took to social media to point out the hidden detail.
The Duchess of Sussex celebrated her 44th birthday on Monday with her family in California.
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Meghan captioned her birthday post: "Blowing out the candles on a beautiful 24 hours, and thanking my husband, friends and family for making it so special.
"To those of you I don’t know, but who send love every day - thank you so much. Please know I feel it and appreciate it.
"And just to get a little foodie on you….this dinner last night at @funke_la with the culinary mastery of @evanfunke and his team is in the top five meals of my life.
"Thank you for a standout dining experience."
The message came just hours after Prince Harry's feud with Sentebale chairwoman Dr Sophie Chandauka was reignited.
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Prince Harry is said to be "absolutely devastated" by the public row at Sentebale, the charity he co-founded nearly two decades ago.
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On Tuesday, the Charity Commission concluded its compliance case into Sentebale with a Regulatory Action Plan to address governance weaknesses.
The report found there was confusion over roles, especially around powers delegated to the chair, and lacked proper internal complaints policies with no clear processes to resolve disputes.
The Commission did not find evidence of widespread bullying, harassment, misogyny, or misconduct by Prince Harry or by any other trustees but did acknowledge that several people involved felt they had been mistreated, and that those feelings should not be dismissed.
Prince Harry is said to be "absolutely devastated" by the public row at Sentebale, the charity he co-founded nearly two decades ago.