Britain's Prince Harry is to be Best Man at the wedding of his elder brother William to Kate Middleton, the princes' office confirmed on Monday.

Middleton has also, as expected, chosen her sister Pippa to be her Maid of Honor when the couple tie the knot at London's Westminster Abbey on April 29.

Other bridesmaids and page boys are made up of young children from friends and members of the royal family, including Louise Windsor, the daughter of William's uncle Prince Edward.

Margarita Armstrong-Jones, daughter of Viscount Linley, who is son of Queen Elizabeth's late sister Margaret, Grace van Cutsem, William's goddaughter, and Eliza Lopes are the three other bridesmaids.

William Lowther-Pinkerton, son of William's private secretary, and Tom Pettifer, son of the prince's former nanny and his godson, will be the two page boys.

Details of all the outfits they will wear will not be given out until the wedding day, Clarence House said.

It also announced the couple will undertake two official engagements later this month, a naming ceremony for a lifeboat, and a reception to mark the start of the 600th anniversary of St Andrews University in Scotland where they met as students.