Britain's Prince Harry (R) and Britain's Prince William, Duke of Cambridge attend the opening of Greenhouse Sports Centre in central London on April 26, 2018, which will provide sport, coaching and social facilities for young people in the surrounding community. Britain's Prince Harry has finally asked Prince William to be his best man at his wedding next month, Kensington Palace confirmed Thursday, reinforcing the brotherly bond between them. / AFP PHOTO / POOL / Toby Melville