But it's certainly not the first time that 22-year-old royal Lady Amelia Windsor has raised some eyebrows.
The Duke of Kent’s Granddaughter, who is 38th in line to the throne, was pictured strolling along the beach in coastal town, Santa Eulalia, as well as tucking into her lunch topless.
The model, who has been named the most beautiful royal by Tatler, is known for occasionally straying from the boundaries of tradition.
Amelia recently revealed a sideboob tattoo on her rib cage, and is often photographed partying and drinking with pals.
But what other traditions has Lady Mel strayed from? We've rounded up all her rather un-royal moments.
"Go hard or go home"
With snaps reminiscent of Prince Harry's party days, Lady Amelia certainly seems to enjoy a boozy get-together with mates.
On a past holiday, the young royal was pictured partying, puffing on cigarettes and drinking with mates.
According to the MailOnline, Amelia's previous Instagram "motto" read: "go hard or go home" – and the 22-year-old certainly seems to be living up to it.
She wears whatever she wants
Royals tend to have pretty strict traditions when it comes to fashion, including no shoulders on show.
And while these rules are likely to be lenient for non-working royals like Amelia, the young royal tends to go with whatever she fancies, with past outfits including a sheer, full length gown – with Dior underwear on display – and a caped, black PVC dress (also Dior) for a fashion event in London earlier this year.
The royal also made a daring choice for last year's British Fashion Awards and stepped out braless in a see-through corset lace dress by Dior.
She has a sideboob tattoo
There's no rule to say royals can't have tattoos, but we can't imagine the Queen goes mad for them.
The royal has a delicate sideboob inking on her rib-cage, as well as tattoos on each of her wrists and a tiger on her shoulder.
She skipped the Queen's Christmas dinner
According to the Express, Amelia swapped the Queen's official festive dinner last year to holiday on the snowy slopes of the French Alps.
Her grandfather, the Duke of Kent was present – as well as Kate Middleton and Meghan Markle – but Amelia was reportedly absent from the celebrations.
She posed topless
Lady Amelia Windsor has certainly been enjoying the sun this week, after she was pictured posing topless in Ibiza.
The model strolled across the sand in a skimpy pair of pink and orange Tory Burch bikini bottoms, worth £119.
And although Amelia's topless sunbathing is said to be going against protocol, many fans have been supporting her decision to strip off.
One social media user tweeted: "Protocol's need to move with the times. Topless is now the norm on lots of foreign beaches.
"If we kept to the same protocols forever then royals would still be all wearing ankle length dresses, no trousers, no jeans and not marrying divorcees."
Earlier this week, we told you why Meghan Markle will NOT be allowed to keep some her birthday gifts.
We also revealed you've probably been pronouncing Eugenie all wrong…here's how you say it.
And we showed you the six things Meghan Markle WON’T be allowed to do on her birthday (including eating cake before the Queen).
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