Princess Charlotte is growing up so fast.
The 4-year-old daughter of Prince William and Kate Middleton started school today, waving and smiling at photographers as she walked beside her big brother Prince George, 6, through the gates of St Thomas's in Battersea in south London.
Just two years ago, it was a shy George arriving at the school gate with his father — his mother missed the occasion as she was experiencing severe morning sickness in her pregnancy with Prince Louis.