(CNN) - Britain's Prince Harry and actress Meghan Markle are set to tie the knot on May 19.
It's assumed that Harry will pick his brother, Prince William, to be his best man, but William said Harry hasn't asked him yet.
Traditionally, royal weddings don't include a "best man." Instead, the groom picks "supporters."
For example, when Prince Charles married Princess Diana in 1981, his "supporters" were his brothers, Andrew and Edward.
William broke with tradition at his 2011 wedding, picking Harry to be his best man.
Kate's sister, Pippa Middleton, served as maid of honor.
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