ROYAL RASCALS RUN WILD

After performing their duties, the little ones let loose!

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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."