Her adorable grin, impish confidence and playful nature mean that at the age of four Princess Charlotte is already a favourite with royal fans.And as these official photographs show, many of her loveable traits have clearly been passed down the line.For Charlotte is an action girl, just like her mother the Duchess of Cambridge.The three new images, taken by keen photographer Kate, have been released to mark the princess’s fourth birthday today. They were taken last month at the family’s homes at Kensington Palace and Anmer Hall.In one, Charlotte can be seen in a blue floral dress with a Peter Pan collar, taking advantage of warm spring weather in London. Kate loves dressing her daughter in blue – it has featured in many of her portraits – and Charlotte wears navy Hampton canvas Plum shoes with her hair tied back with a blue bow. Princess Charlotte’s fourth birthday has been marked by the release of three pictures taken by her mother, the Duchess of Cambridge, 37. In the first, she is pictured in a summer dress as she sits on the grass at Kensington Palace Style your princess like birthday girl Charlotte in a dress from Trotters Lily Rose ‘Betsy’ dress…