Sophie was marrying her fiancé Robert Suggs at St Andrew’s Church in Norfolk, UK, on Sep. 22.
George was a pageboy for the ceremony and was dressed for the part in blue shorts and white, buttoned shirt.
He also wore a pair of smart, white loafers for the big day.
Princess Charlotte meanwhile was a flower girl for the occasion and could be seen clutching a bouquet of pretty flowers and a blue satin bag.
The young royals’ mother, Kate Middleton, also appeared to be part of the bridal party as she wore a matching blue outfit and had blue flowers in her hair.
Kate has been a close friend of Sophie’s for some time.