Prince Harry has always been a royal rebel. At 17, he was taken to a rehab centre after he admitted to smoking marijuana and illegally drinking alcohol.

At 27, TMZ released naked pictures of the royal, who was reportedly playing strip billiards in a Las Vegas hotel suite.

For over two decades, Harry has been rewriting the royal rule book.

And now, Harry has found the perfect partner-in-crime. With American-actress Meghan Markle on his arm, the British Monarchy is receiving the modern treatment it so desperately needs. From pantyhose to PDA, here are all the times that Prince Harry and Meghan Markle broke royal protocol.

Meghan's coat of arms does not include her family name

With the tiara and the title also comes your very own emblem. Now that's she's officially a member of the British monarchy, the Duchess of Sussex has received a personalized coat of arms. Traditionally, the symbolic gift usually goes to the father of the bride ahead of the royal wedding. Kate Middleton's coat of arms not only reflects the Middleton family, but also her mother Carole's maiden name, Goldsmith. With the newest addition to the family, the honour was bestowed on only Meghan Markle.

The coat of arms, does however, pay homage to Meghan's roots. The custom design includes a blue background, the Pacific Ocean and two golden rays, sunshine, which Kensington Palace says is representative of the Duchess' home state of California.

A two ring royal wedding ceremony

Usually, royal men don't sport wedding bands after they marry. Harry's grandfather, father and brother have all opted to follow this tradition by wearing a ring after they wed their respective wives. Harry and Meghan have broken this tradition, exchanging wedding rings at the marriage ceremony. This signifies equality in the marriage and is a modern leap for the monarchy.

Meghan starts her bridal procession alone

With the world watching, Meghan Markle made a striking feminist statement as she walked down the first portion of the bridal procession, down the aisle of St. George Chapel alone. She's the first royal bride in UK history to shake up royal norms by walking into their wedding ceremony without a father-figure on her arm.

They served lemon elderflower cake at their wedding

They have forgone the traditional fruitcake royal wedding cake in order to have a tart, buttercream-covered confection on their big day.

A fruitcake was originally a symbol of wealth and prosperity because of its precious ingredients such as dried fruits, alcohol, and spices. Furthermore, the cake, in a way, represented the vastness of the British empire, using ingredients from far-flung corners of the globe.

Queen Victoria and Prince Albert served the traditional British wedding cake, as have countless royals through the years including Queen Elizabeth and Prince Phillip, as well as Prince William and Kate Middleton, whose elaborate eight-layer cake was filled with fruitcake.

And the person helping them flout this tradition this time is California-born, London-based pastry chef Claire Ptak, who owns a bakery in East London. Claire was featured on Meghan's now-defunct lifestyle blog The Tig. Ptak shared the news on her bakery's Instagram page, adding that she and the couple "share so many of the same values regarding food provenance, sustainability, seasonality and of course, flavour."

Kensington Palace gave more details, stating on Instagram that "The couple have asked Claire to create a lemon elderflower cake that will incorporate the bright flavours of spring. It will be covered with buttercream and decorated with fresh flowers."

Meghan gets political

As a rule, members of the royal family aren't supposed to make political statements. (This, we can only assume, is why Kate Middleton opted for a green dress for this year's BAFTAs, rather than wearing a black gown in solidarity with the Time's Up movement.

When Meghan joined Prince William, Kate and her fiancé Prince Harry for the first-ever Royal Foundation Forum, she shared her opinions on the subject of female empowerment.

"I hear a lot of people speaking about girls' empowerment and women's empowerment; you will hear people saying they are helping women find their voices. I fundamentally disagree with that because women don't need to find their voices, they need to be empowered to use it and people need to be urged to listen. Right now, with so many campaigns like #MeToo and Time's Up, there's no better time to continue to shine a light on women feeling empowered and people supporting them."

Meghan wore a crossbody bag

The princess-to-be arrived at Edinburgh Castle wearing an appropriately chic and seemingly inoffensive outfit: Burberry coat, Veronica Beard pants, Birks rings and a Strathberry bag. But it's not what Markle was wearing that broke protocol, per se, it was how she was wearing it.

According to royal expert William Hanson, royals always carry a clutch as a means to avoid shaking hands. "It is protocol that you do not extend your hand to any member of the royal family, blood royal or those who have married into the family, unless their hand extends first."

Meghan will give her own wedding speech

In the distinguished realm of royal weddings, it's relatively uncommon for the bride to deliver a speech. The honour of lifting a glass and sharing your thoughts has long been reserved for the groom, the father of the bride, and the best man.

But Meghan Markle has never been one to shy away from using her voice. Meghan gave a toast at her wedding reception and paid an affectionate tribute to new husband Prince Harry and thanked the Queen for graciously hosting the celebration. Harry, of course, gives his full support.

Christmas with the Queen

After weeks of rumours, Kensington Palace officially confirmed that Meghan Markle was spending Christmas 2017 with Prince Harry. Her invitation broke royal tradition, because she had not yet married into the royal family. A palace spokesperson told AP that "you can expect to see the Duke and Duchess of Cambridge, Prince Harry and Ms. Markle at Sandringham on Christmas Day."

Meghan ignored the pantyhose policy

The royal family has an unspoken policy about wearing pantyhose in public. It's not a style-code that's set in stone, per say, but it's a tradition that's long been upheld by Queen Elizabeth, the Duchess of Cambridge and the royals.

Until now! When Meghan stepped out with Prince Harry for their official engagement photocall, the world ogled every inch of the American actress' outfit. The Internet went wild for Markle's snow white overcoat by LINE the Label and her opal earrings from Birks, but royal watchers were quick to note the one thing she wasn't wearing: pantyhose.

They're tying the knot in May

There's nothing better than a spring wedding, right? WRONG. It turns out, a marriage in May would not have been approved by the Prince's great-great-great granny, Queen Victoria. The late, great monarch believed it was unlucky to marry in the fifth month of the calendar year, buying into the superstitious rhyme: "Marry in May, and rue the day."

Meghan was married before

Before hooking up with Harry, Meghan was in a long-term relationship with producer Trevor Engelson. The Hollywood power couple married in 2011, after seven years of dating, and divorced in August of 2013. Now, Engelson is making a show about a man who has to share custody of his child after his ex-wife marries into the British monarchy. According to Deadline, this is the plot: "Divorce is hard. Sharing custody is harder. Sharing custody with the British Royal family when your wife marries a prince, in the unforgiving spotlight of London's tabloid media, is next level."

Previously, members of the Royal Family have not been allowed to marry divorcees. Princess Margaret had to break off her relationship with Peter Townsend because he was divorced, and Edward VIII abdicated from the throne in order to marry American socialite Wallis Simpson. But it's not a big of deal anymore: Prince Harry and Prince William's father, Prince Charles, married fellow divorcee Camilla, Duchess of Cornwall, in a civil ceremony in 2005.

Prince Harry is the first royal family member to have a church wedding with a divorcee. In 2002, the Church of England agreed that divorced people could remarry in church, with the discretion of the priest, of course.

Meghan wasn't Anglican

For centuries, it was forbidden for royals to marry a Roman Catholic. However in 2015, an amendment to the Act of Settlement of 1701 made that allowed British royals to have an interfaith marriage. Meghan never discussed her religious affiliations openly, though it has been widely reported that her father is Jewish and she attended an all-girls Catholic high school in Los Angeles.

Before her Windsor Castle wedding to Prince Harry, Meghan was baptised and confirmed in the Church of England. By completing these religious sacraments, Meghan honoured the Queen Elizabeth, who, as the Sovereign, holds the title of "Defender of the Faith and Supreme Governor of the Church of England."

They're all about the PDA

Hand-holding is a public display of affection.

There are no specific anti-PDA rules, but public displays of affection have previously been avoided by the royal family at official events, due to their position as working representatives of the British monarchy. For example: The Duke and Duchess of Cambridge have been photographed holding hands less than a dozen times in the past 10 years.

Prince Harry and Meghan Markle have ignored this unspoken rule at pretty much every opportunity. When they made their first public appearance, the couple shared a kiss. During their joint appearance at Toronto's Invictus Games, they were photographed holding hands. Even when they stepped out together as an engaged couple, Markle and Harry couldn't keep their hands off of each other!

Meghan's Vanity Fair cover

It's not unprecedented for a royal to grace a magazine cover, after all, the Duchess of Cambridge was in British Vogue, but to open up about her private life with Harry pre-engagement was a big shock for royal watchers. Prince Harry and Meghan are madly in love and not afraid to share it with the world.

"We're two people who are really happy and in love," she said. "We were very quietly dating for about six months before it became news, and I was working during that whole time, and the only thing that changed was people's perception. Nothing about me changed. I'm still the same person that I am, and I've never defined myself by my relationship."

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