Britain's prince George (L), a pageboy, attends the wedding of his aunt Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. [Photo/Agencies]

Three-year-old Prince George, third in line to the throne after grandfather Charles and father William, took a starring role with his younger sister as attendants to the bride.

Middleton, 33, who married financier James Matthews, wore an elegant white lace gown with a cut-out in the back and a full long skirt. She arrived in a open-top car accompanied by her father, smiling broadly and waving to crowds gathered near St. Mark's church in Englefield, about 50 miles west of London.