Meghan Markle and the queen step out together in royal first

Meghan Markle ... and the queen!

The former "Suits" actress made her most important royal debut yet on Monday, when she stepped out with fiancé Prince Harry, Prince Charles, Duchess Camilla, Prince William, Kate Middleton and Queen Elizabeth herself for a Commonwealth Day church service at Westminster Abbey.

Rocking a white topcoat and a matching white beret over a navy dress, Markle strode into the church with Harry, Kate and William, while Her Majesty wasn't far behind in a burgundy coat and hat adorned with flowers.

See photos from the outing:

18 PHOTOS
Meghan Markle joins Queen Elizabeth and rest of royal family for Commonwealth Day
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Meghan Markle joins Queen Elizabeth and rest of royal family for Commonwealth Day
LONDON, ENGLAND - MARCH 12: Meghan Markle and Prince Harry attend the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 12: (L-R) Meghan Markle, Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - MARCH 12: Meghan Markle attends the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 12: Meghan Markle and Prince Harry attend the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
Britain's Prince Harry (R) and his fiancee US actress Meghan Markle attend a Commonwealth Day Service at Westminster Abbey in central London, on March 12, 2018. Britain's Queen Elizabeth II has been the Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - MARCH 12: Meghan Markle attends the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - MARCH 12: Meghan Markle attends the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Prince Harry and Meghan Markle, arrive for the Commonwealth Service at Westminster Abbey, London. (Photo by Joe Giddens/PA Images via Getty Images)
The Duke and Duchess of Cambridge, arrive for the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)
Britain's Catherine, Duchess of Cambridge, (2R) and her husband Britain's Prince William, Duke of Cambridge (R), arrive with Britain's Prince Harry (C) and his fianc� US actress Meghan Markle to attend a Commonwealth Day Service at Westminster Abbey in central London, on March 12, 2018. Britain's Queen Elizabeth II has been the Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, (L) and her husband Britain's Prince William, Duke of Cambridge, attend a Commonwealth Day Service at Westminster Abbey in central London, on March 12, 2018. Britain's Queen Elizabeth II has been the Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Prince Harry and Meghan Markle, arrive for the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)
LONDON, ENGLAND - MARCH 12: Queen Elizabeth II and the Dean of Westminster, the Very Reverend John Hall attend the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - MARCH 12: Queen Elizabeth II attends the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Neil Mockford/GC Images)
LONDON, ENGLAND - MARCH 12: Queen Elizabeth II and the Dean of Westminster, the Very Reverend John Hall attend the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Queen Elizabeth II, arrives for the Commonwealth Service at Westminster Abbey, London. (Photo by Joe Giddens/PA Images via Getty Images)
Queen Elizabeth II, arrives for the Commonwealth Service at Westminster Abbey, London. (Photo by Joe Giddens/PA Images via Getty Images)
Queen Elizabeth II with Dr John Hall, the Dean of Westminster as she arrives for the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)
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During the service, Markle was seen singing along to "God Save the Queen."

The importance of Markle attending an event with Queen Elizabeth before officially marrying into the royal family is one that wasn't lost on fans of the royals. The former actress has been accepted into their inner circle quite quickly, and the fact that she made an appearance with Harry's grandmother before their wedding is indicative of that.

For her part, Duchess of Cambridge Kate Middleton didn't attend any events with her grandmother-in-law before marrying Prince William back in 2011. 

The outing comes months after another major exception was made on Markle's behalf when she spent the Christmas holiday with the senior members of the royal family at her Sandringham residence. Normally, that honor is reserved for figures who are officially part of the family.

Meghan Markle has broken the often-antiquated royal protocol on numerous other occasions, albeit in more subtle ways, like rocking a messy bun or signing an autograph. 

Here are all the times Meghan Markle has broken the rules:

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Every time Meghan Markle has broken royal protocol
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Every time Meghan Markle has broken royal protocol

When she ditched the tights

Wearing hosiery is reportedly an unspoken rule for female members of the royal family, and one that Queen Elizabeth is a stickler for. Meghan Markle defied tradition when she went sans tights for her engagement photos.

(Getty)

When she spent Christmas with Queen Elizabeth

Meghan Markle made history when she became the first fiancée to spend Christmas with the queen at her Sandringham residence. Usually, events with the queen are reserved for spouses of royals. When Kate Middleton was engaged to Prince William she wasn't given that special privilege and instead spent the holiday with her own family.

(Getty)

When she wore a messy bun

There's no rule (that we know of) that claims royal ladies must have perfect blown out tresses for all royal engagements, but it's a look we've become accustomed to since Duchess Kate came into the picture in 2011 with her glossy curls and impeccable chignons. 

(Getty)

When she decided to make a speech at her own wedding

In Britain, traditionally the groom, father of the bride, and the best man make speeches after the wedding. However, the former actress will make a speech at her May 19 ceremony to pay tribute to Prince Harry and his family.

(Getty)

When she showed PDA with Prince Harry

Royal couples usually refrain from showing PDA in public -- a precedent set by Queen Elizabeth -- but it seems as if Meghan and Harry can't get their hands off each other!

(Getty)

When she gave an autograph

Royals aren't allowed to give autographs for security reasons, but Meghan Markle made an exception for one 10-year-old girl.

(Getty)

When she hugged kids

Again, for security reasons, royals are usually required to keep their hands to themselves (handshakes are okay). However, Meghan Markle defied that rule when she gave a group of children hugs while visiting a community center.

(Getty)

When she wore head-to-toe black

Usually, the dark hue is reserved for somber occasions like funerals or events like Remembrance Sunday Service. In fact, you'd never see Duchess Kate stepping out in an outfit like this for any public appearance.

(Getty)

When she wore a suit to a black-tie event

Meghan Markle shocked and stunned the world when she showed up to a black-tie affair with an Alexander McQueen suit on instead of a ball gown. While there's no official rule that royals must wear gowns, the move broke from tradition in a major way.

(Getty)

When she wore a crossbody bag

Holding clutches during public appearances is usually the norm for members of the royal family. Because protocol states you shouldn't offer your hand to any member of the royal family, Kate opts for clutches to avoid any awkward confrontations. However, Meghan surprised everyone when she stepped out in Scotland with a crossbody.

(Getty)

When she took a political stance

When she appeared alongside Duchess Kate, Prince Harry and Prince William, Meghan Markle expressed her support for the #MeToo and #TimesUp movements. It was a surprising moment considering protocol forbids members of the royal family to take sides on political issues.

(Getty) 

Meghan Markle's side bun

She does it again! Meghan rocked a chic side bun during a surprise trip to Ireland, but just like her messy bun, it's an uncommon style for royals to rock.

(Getty)

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