Princess Charlotte sticks out her tongue at Buckingham Palace for RAF 100

Another day, another viral Princess Charlotte moment.

Just a day after the 3-year-old royal made headlines for her adorable (and frankly, polite) antics at her little brother Louis' christening, the tot has once again stolen the show -- but this time with a naughty moment.

The royal family, including Duchess Kate, Prince William, Duchess Meghan and Prince Harry, joined Queen Elizabeth on the balcony of Buckingham Palace on Tuesday morning to mark the Royal Air Force's 100th birthday. Passersby were treated with a special flypast, a show that included Prince George and Princess Charlotte as spectators from inside the palace.

Charlotte, ever the handful, took the ceremony as an opportunity to entertain photographers, with a few signature waves. At one point, however, she decided to stick out her tongue to the crowds and bang on the window. It's a "naughty" move she's been spotted pulling a number of times, most recently at the royal wedding back in May.

See the hilarious moment unfold in the video above!

For more adorable Princess Charlotte moments, scroll through below!

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Princess Charlotte sticks out her tongue as she rides in a car to the wedding at St George's Chapel in Windsor Castle of Prince Harry and Meghan Markle Windsor, Britain May 19, 2018. Andrew Milligan/Pool via REUTERS
LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge during the Trooping the Colour, this year marking the Queen's 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Mark Cuthbert/UK Press via Getty Images)
VICTORIA, BC - SEPTEMBER 24: Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge arrive at the Victoria Airport on September 24, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna. (Photo by Chris Jackson/Getty Images)
VICTORIA, BC - SEPTEMBER 24: Catherine, Duchess of Cambridge and Princess Charlotte arrive at Victoria Airport ahead of their Royal Tour of Canada and Yukon on September 24, 2016 in Victoria, Canada. (Photo by Karwai Tang/WireImage)
VICTORIA, BC - SEPTEMBER 24: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge arrive at Victoria airport for the start of of their Royal tour of Canada on September 24, 2016 in Victoria, Canada. (Photo by Samir Hussein/WireImage)
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Carcross, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: (NO UK SALES FOR 28 DAYS) Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. (Photo by Pool/Sam Hussein/WireImage)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge and Princess Charlotte wave leave from Victoria Harbour to board a sea-plane on the final day of their Royal Tour of Canada on October 1, 2016 in Victoria, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson/Getty Images)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge and Princess Charlotte wave leave from Victoria Harbour to board a sea-plane on the final day of their Royal Tour of Canada on October 1, 2016 in Victoria, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson/Getty Images)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge and Princess Charlotte wave leave from Victoria Harbour to board a sea-plane on the final day of their Royal Tour of Canada on October 1, 2016 in Victoria, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson/Getty Images)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge Princess Charlotte of Cambridge depart Victoria on October 1, 2016 in Victoria, Canada. (Photo by Samir Hussein/WireImage)
VICTORIA, BC - OCTOBER 01: (NO UK SALES FOR 28 DAYS) Princess Charlotte of Cambridge departs Victoria on October 1, 2016 in Victoria, Canada. (Photo by Pool/Samir Hussein/WireImage)
VICTORIA, BC - OCTOBER 01: Princess Charlotte leaves from Victoria Harbour to board a sea-plane on the final day of their Royal Tour of Canada on October 1, 2016 in Victoria, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Stephen Lock - Pool/Getty Images)
BUCKLEBURY, BERKSHIRE - DECEMBER 25: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend Church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Danny Martindale/WireImage)
Britain's Catherine (L), Duchess of Cambridge leads her daughter Princess Charlotte out of church after attending a Christmas Day service at St Mark's Church in Englefield on December 25, 2016. / AFP / POOL / Andrew Matthews (Photo credit should read ANDREW MATTHEWS/AFP/Getty Images)
BUCKLEBURY, BERKSHIRE - DECEMBER 25: Princess Charlotte of Cambridge attends Church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
NORFOLK, ENGLAND - APRIL 2017: In this undated handout image released by the Duke and Duchess of Cambridge, Princess Charlotte is pictured at home in April in Norfolk, England. The photograph was taken in April by The Duchess at their home in Norfolk to mark Princess' second birthday. (Photo by HRH The Duchess of Cambridge via Getty Images) NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph is provided to you strictly on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess of Cambridge attend the wedding Of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge look on from the balcony during the annual Trooping The Colour parade on June 17, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge look on from the balcony during the annual Trooping The Colour parade on June 17, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JUNE 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with Prince George of Cambridge and Princess Charlotte of Cambridge on the balcony at Buckinghgam Palace during the annual Trooping The Colour parade on June 17, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge on the balcony at Buckingham Palace during the annual Trooping The Colour parade on June 17, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Prince George and Princess Charlotte look out of the airplane window as they arrive at a military airport in Warsaw, Poland July 17, 2017. REUTERS/Kacper Pempel TPX IMAGES OF THE DAY
Princess Charlotte looks out of the airplane window at Tegel airport in Berlin, Germany, July 19, 2017. REUTERS/Fabrizio Bensch
Princess Charlotte on the steps of St George's Chapel in Windsor Castle after the wedding of Prince Harry and Meghan Markle in Windsor, Britain, May 19, 2018. Jane Barlow/Pool via REUTERS
Princess Charlotte of Cambridge arrives at the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle in Windsor, Britain, May 19, 2018. Chris Jackson/Pool via REUTERS
Princess Charlotte outside St George's Chapel in Windsor Castle after the wedding of Prince Harry and Meghan Markle in Windsor, Britain, May 19, 2018. Brian Lawless/Pool via REUTERS
WINDSOR, ENGLAND - MAY 19: Princess Charlotte attends the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. Chris Jackson/Pool via REUTERS
GLOUCESTER, UNITED KINGDOM - JUNE 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Princess Charlotte of Cambridge attends the Maserati Royal Charity Polo Trophy at the Beaufort Polo Club on June 10, 2018 in Gloucester, England. (Photo by Max Mumby/Indigo/Getty Images)
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