London, England (CNN) -- Prince William's younger brother Prince Harry will be his best man when he marries Kate Middleton in London in April, Clarence House announced Monday. Middleton's sister Philippa will be her maid of honor. 

William, who is second in line to the throne, is due to marry his long-time girlfriend April 29 at Westminster Abbey. Prince Harry is currently third in line of succession. 

Royal protocol states that the groom should have a "supporter" rather than a Best Man and speculation was rife that Prince Harry would be named supporter, and another friend of Prince William announced as his best man. 

Prince Charles elected his brother Prince Andrew to be his "supporter" when he married Diana, Princess of Wales in 1981. 

Naming Harry best man is a break with protocol, and is being taken as an indication of William and Kate's more modern approach to their upcoming wedding, which is taking place at Westminster Abbey on April 29. 

Harry will be organizing the Prince's "stag" or bachelor party. Meanwhile Philippa, or "Pippa," will be expected to pull together Kate's "hen" or bachelorette party. 

William's office at Clarence House also announced that there will be four bridesmaids and two page boys, including two of William's godchildren. 

They are Grace van Cutsem, 3, and Tom Pettifer, 8. Pettifer is the son of Tiggy Pettifer, William and Harry's former nanny -- an important figure in the young Princes' lives, especially following the death of their mother in 1997. 

Lady Louise Windsor, 7, the Hon. Margarita Armstrong-Jones, 8, and Eliza Lopes, 3, will be the other bridesmaids. 
Who is the best man in Prince William's wedding?
Who is he marrying?
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Who was second in line to the throne?
Who did Prince Charles choose as his supporter?
What did it mean when Prince William broke protocol?
Where was the wedding to be?
Who was expected to put together Kate's hen party?
What is a hen party?
How many bridesmaids are there?
Was there any other notable parties?
When did Prince Charles marry Diana?
What was royal protocol?
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When did Diana pass away?
Who is 3rd in line of succession for the throne?
Prince Harry
Prince William's younger brother Prince Harry will be his best man
Kate Middleton
 he marries Kate Middleton
April 29
marry his long-time girlfriend April 29
the groom should have a "supporter" rather than a Best Man
Royal protocol states that the groom should have a "supporter" rather than a Best Man 
William
William, who is second in line to the throne,
Prince Andrew
Prince Charles elected his brother Prince Andrew to be his "supporter
a more modern approach to their wedding,
Naming Harry best man is a break with protocol, and is being taken as an indication of William and Kate's more modern approach to their upcoming wedding,
Westminster Abbey
which is taking place at Westminster Abbey
Pippa
Meanwhile Philippa, or "Pippa," will be expected to pull together Kate's "hen
a bachelorette party.
"hen" or bachelorette party. 
four
 there will be four bridesmaids
William and Harry's former nanny
William and Harry's former nanny -- an important figure in the young Princes' lives,
in 1981.
Prince Charles elected his brother Prince Andrew to be his "supporter" when he married Diana, Princess of Wales in 1981. 
the groom should have a "supporter" rather than a Best Man
Royal protocol states that the groom should have a "supporter" rather than a Best Man
stag
"stag" or bachelor party
1997.
the death of their mother in 1997. 
Prince Harry
Prince Harry is currently third in line of succession. 