Princess Charlotte was spotted dabbing during her father's Coronation speech at the concert on Sunday.
The eight-year-old pulled a silly look while moving her arms to 'dab'.
Dabbing is part of a hip-hop dance in which the dancer drops their head and rests it on one arm while raising the other arm simultaneously.
The movement has been popularised after professional athletes did it as part of their celebrations and characters in the video game Fortnite do it.
Viewers were left laughing after seeing the young princess do the movement before cameras quickly cut away.
She sat in between her mum Kate and brother Prince George while Prince William made a touching speech to King Charles III.
One wrote on social media: "Princess Charlotte randomly Dabbing was not on my coronation bingo card."
Another added: "On another note, is it just me or did Princess Charlotte do a dab during her dad's speech?"
A third said: "Did Princess Charlotte just go to dab and they cut the camera hahahaha"
During his speech, Prince William said the late Queen would be “a proud mother” after the nation came together to witness history at King Charles’ Coronation.
In a heartfelt speech, the Prince of Wales paid tribute to his father’s list of lifetime accomplishments, from passionately campaigning on the environment to changing the lives of one million disadvantaged young people by creating the Prince’s Trust Awards.
As the country digests what is next for the royal family following the most diverse and inclusive Coronation in history, the heir proclaimed: “Pa, we are all so proud of you.”
At the spectacular concert in the grounds of Windsor Castle, where the late Queen Elizabeth spent most of her final years, William heralded Charles’ commitment to duty spanning more than 50 years helping communities across the UK and the Commonwealth.
After a television audience of more than 18 million Brits watched William swear an oath to the King in Westminster Abbey, kneeling down and vowing to be “your liege man of life and limb”, tonight the Prince of Wales proclaimed his own commitment “King, Country and Commonwealth.”
Princess Charlotte was spotted dabbing during a rather serious moment.
But viewers did a double take after the princess appeared to do the gesture whilst speaking to her mother. One person tweeted: "Did Charlotte just hit the dab for the Prince’s Trust or am I seeing things"?
