Britain's Prince Harry has asked his elder brother Prince William to be his best man at his wedding to US actress Meghan Markle next month, his office says.
Harry was William's best man at his own glittering wedding to wife Kate Middleton in 2011.
"The Duke of Cambridge is honoured to have been asked, and is very much looking forward to supporting his brother at St George's Chapel, Windsor on May 19th," Kensington Palace said.
Earlier this week William and Kate, whose official titles are the Duke and Duchess of Cambridge, celebrated the arrival of their third child.
The role means William, whose official title is the Duke of Cambridge, will miss English soccer's FA Cup final as it clashes with the wedding, media reported. William, as President of the Football Association, usually awards the trophy to the winners.
Harry and Markle have invited 600 guests to their wedding and a lunchtime reception afterwards at Windsor with another 200 attending a private evening event at nearby Frogmore House.
No political leaders are among the invitees and the wedding guests will be made up of people who have an existing direct relationship with the groom or the bride.
However, the couple have invited 1200 members of the public into the grounds of Windsor Castle, Queen Elizabeth's home west of London, as part of the celebrations.
Details of bridesmaids and who else will make up the wedding party have yet to be released.