ROYAL RASCALS RUN WILD

After performing their duties, the little ones let loose!

Princess Charlotte and Prince Louis had been preparing for their big moment for weeks!

"Charlotte has been so full of excitement about her very important role," a source says of the eight-year-old, who along with brothers Prince George, nine, and Louis, five, accompanied King Charles and Queen Camilla as they left Westminster Abbey after the service. "She's been talking about it non-stop, practising her walk and her curtsies to perfection. She took it upon herself to keep her little brother in step after spending hours coaching him through what would happen."

According to the royal insider, Charlotte even made her mum, the Princess of Wales, show her and her siblings the abbey on Google Earth so they were familiar with everything.