Kate Middleton arrives at Platinum Jubilee with George, Charlotte, Louis

Prince George, Princess Charlotte and Prince Louis looked all grown up arriving at

Trooping the Colour with mom Kate Middleton and step-grandmother Camilla Parker Bowles on Thursday.

The little ones rode in a carriage with the Duchess of Cambridge, 40, and the Duchess

of Cornwall, 74, as Queen Elizabeth II’s Platinum Jubilee birthday celebration kicked off.

The siblings waved at the crowds from their seats. George, 8, smiled in a navy suit

with his 7-year-old brother sitting beside him.

Charlotte, 4, sat next to Louis in a blue dress.

Middleton was all smiles positioned across from the children,

waving in a white Alexander McQueen dress and black hat.