At just three-years-old Princess Charlotte is known for stealing the show with her adorable royal wave and confident nature. Stepping out for her little brother Prince Louis' baptism on Monday, the youngster was in her best form as she went about her royal duties.
In her signature look, a Little Alice London blue floral sun dress with puffy sleeves, the princess arrived at The Chapel Royal at St James's Palace in London where she dutifully greeted the Arch Bishop of Canterbury with a handshake. William said "Well done!" to his two older children as they behaved beautifully.
Charlotte also gave a royal wave to the photographers waiting outside, while George appeared a little shy.
Upon passing by the photographers a second time, Charlotte showed her true confidence as she cheekily reminded the media they were not invited to the private family event.
Leaving the chapel and walking alongside her father with the ceremony booklet purposely under her arm, Charlotte said to photographers, "You're not coming."
Charlotte's stern remark put a smile on her mum's face. Kate, 36, then responded, "Why not?"
WATCH: "You're not coming!" Princess Charlotte warns photographers...
While Charlotte may only be three years old, she certainly has her own style and as Prince William, 36, has previously revealed, an interest in fashion. For the family affair, Charlotte debuted a brand new hairstyle. Clearly blessed with her mother's glossy locks, Charlotte's bob was parted in the centre under a sweet blue headband.
Usually the Cambridge's middle child wears her hair parted on the side or pulled back into a half-up style, like she did for her recent polo outing and for uncle Prince Harry's royal wedding.
Charlotte's older brother Prince George showed his more reserved side at the occasion, keeping close to his dad's side.
The special occasion marked the first time the family of five have been photographed together. Duchess Catherine craddeled the sleeping 11-week-old Louis as the family arrived for the baptism.
The sleeping Prince looked peaceful and unaware of all the fuss carrying on around. Kate was overhead calling her third child "very relaxed and peaceful," before confessing: "I hope he stays like this!"
The Duchess couldn't have looked more in love with her darling baby boy.
Prince Louis christening was also attended by his uncle and aunt, Prince Harry and Meghan Markle, proud grandfather Prince Charles and his wife Duchess Camilla, as well as Kate's family, Carole Middleton, Michael Middleton, James Middleton and a pregnant Pippa Middleton.
Unfortunately, Prince Louis' great-grandparents Queen Elizabeth, 92, and Prince Philip, 96, did not attend. It's believed the decision was made not because of health reasons but due to The Queen's hectic upcoming schedule.