Duchess Kate looks gorgeous for first-ever solo outing with the queen

On Tuesday morning, Duchess Kate and Queen Elizabeth stepped out for their first-ever joint appearance.

The royal duo looked like old friends as they arrived by car together at King's College in London to officially open Bush House. This event marked Kate's first outing with the queen without any other royal family members in attendance.

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Duchess Kate and Queen Elizabeth step out at Bush House
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Duchess Kate and Queen Elizabeth step out at Bush House
Britain's Queen Elizabeth II and Britain's Catherine, Duchess of Cambridge arrive to visit Kings College, to open Bush House, the latest education and learning facilities on the Strand Campus, in central London on March 19, 2019 (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
Britain's Queen Elizabeth II and Britain's Catherine, Duchess of Cambridge arrive for a visit to Kings College, to open Bush House, the latest education and learning facilities on the Strand Campus, in central London on March 19, 2019 (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II and Catherine, Duchess of Cambridge visit King's College to officially open Bush House, the latest education and learning facilities on the Strand Campus on March 19, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II and Catherine, Duchess of Cambridge visit King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II and Catherine, Duchess of Cambridge visit King's College London to officially open Bush House, the latest education and learning facilities on the Strand Campus on March 19, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - MARCH 19: Catherine, Duchess of Cambridge visits King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II and Catherine, Duchess of Cambridge visit King's College London to officially open Bush House, the latest education and learning facilities on the Strand Campus on March 19, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - MARCH 19: Catherine, Duchess of Cambridge visits King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 19: Catherine, Duchess of Cambridge visits King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II accompanied by and Catherine, Duchess of Cambridge visit King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Joe Maher/Getty Images)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II accompanied by and Catherine, Duchess of Cambridge visit King's College London on March 19, 2019 in London, England to officially open Bush House, the latest education and learning facilities on the Strand Campus. (Photo by Joe Maher/Getty Images)
Britain's Queen Elizabeth II and Britain's Catherine, Duchess of Cambridge, are met by (L-R) Lord Mayor of Westmnster, councillor Lindsay Hall, former British prime minister Sir John Major, president and principal of Kings College Professor Edward Byrne and chairman of council, Lord Geidt, on their arrival to visit Kings College, to open Bush House, the latest education and learning facilities on the Strand Campus, in central London on March 19, 2019 (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
Britain's Queen Elizabeth II and Britain's Catherine, Duchess of Cambridge, are met by (L-R) Lord Mayor of Westmnster, councillor Lindsay Hall, former British prime minister Sir John Major, president and principal of Kings College Professor Edward Byrne and chairman of council, Lord Geidt, on their arrival to visit Kings College, to open Bush House, the latest education and learning facilities on the Strand Campus, in central London on March 19, 2019 (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
Britain's Queen Elizabeth II and Britain's Catherine, Duchess of Cambridge arrive for a visit to Kings College, to open Bush House, the latest education and learning facilities on the Strand Campus, in central London on March 19, 2019 (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
LONDON, ENGLAND - MARCH 19: Queen Elizabeth II and Catherine, Duchess of Cambridge visit King's College London to officially open Bush House, the latest education and learning facilities on the Strand Campus on March 19, 2019 in London, England. (Photo by Neil Mockford/GC Images)
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Kate stunned in a stylish grey coat dress by Catherine Walker, one of her go-to designers, for the very rare occasion. She completed her look with a Sylvia Fletcher fascinator, black heels and little black Mulberry bag. According to the Daily Mail, Kate wore a hat "likely to be a sign of respect to the monarch."

The queen wore a lovely pink cashmere coat with black detailing by Stewart Parvin, along with a matching pink hat. The 92-year-old royal finished off her springtime look with simple black accessories and a classic pearl necklace.

Kensington Palace also shared on Twitter that after Duchess Kate's morning outing with the queen she will visit the Foundling Museum "to understand how they use art to make a positive contribution to society by engaging with vulnerable and marginalised young people."

See Kate's latest outing with husband Prince William below:

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Prince William and Duchess Kate on St. Patrick's Day 2019
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Prince William and Duchess Kate on St. Patrick's Day 2019
HOUNSLOW, ENGLAND - MARCH 17: Wiliam, Duke of Cambridge and Catherine, Duchess of Cambridge meets with Irish Guards after attending the St Patrick's Day parade at Cavalry Barracks in Hounslow, where they presented shamrock to officers and guardsmen of 1st Battalion the Irish Guards on March 17, 2019 in Hounslow, England. (Photo by Gareth Fuller - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Wiliam, Duke of Cambridge and Catherine, Duchess of Cambridge meets with Irish Guards after attending the St Patrick's Day parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Gareth Fuller - WPA Pool/Getty Images)
HOUNSLOW, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge (Colonel of the Irish Guards) pose for a regiment photograph as they attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Max Mumby/Indigo/Getty Images)
HOUNSLOW, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge (Colonel of the Irish Guards) attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Max Mumby/Indigo/Getty Images)
HOUNSLOW, UNITED KINGDOM - MARCH 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge (Colonel of the Irish Guards) attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Max Mumby/Indigo/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Karwai Tang/WireImage)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Karwai Tang/WireImage)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Karwai Tang/WireImage)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge enjoy a pint of Guinness with officers and guardsmen of the 1st Battalion Irish Guards after the St Patrick's Day parade, at Cavalry Barracks in Hounslow, west London, on March 17, 2019. (Photo by Gareth Fuller / POOL / AFP) (Photo credit should read GARETH FULLER/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge enjoy a pint of Guinness with officers and guardsmen of the 1st Battalion Irish Guards after the St Patrick's Day parade, at Cavalry Barracks in Hounslow, west London, on March 17, 2019. (Photo by Gareth Fuller / POOL / AFP) (Photo credit should read GARETH FULLER/AFP/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by UK Press Pool/UK Press via Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by UK Press Pool/UK Press via Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by UK Press Pool/UK Press via Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
HOUNSLOW, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Samir Hussein/WireImage)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge enjoy a pint of Guinness after attending the St Patrick's Day parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Gareth Fuller - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pose for a photograph with officers and guardsmen of 1st Battalion the Irish Guards during the regiment's St Patrick's Day parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Gareth Fuller - WPA Pool/Getty Images)
HOUNSLOW, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. (Photo by Gareth Fuller - WPA Pool/Getty Images)
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