Prince William is going to be a busy man on May 19th!
That's because not only is he playing Best Man at his baby brother's wedding day, it's also England's big FA Cup Final that he's expected to hand the trophy at.
The Duke of Cambridge has had to call on the folks at Kensington Palace and the Football Association to work out how he can be at both events.
With Prince Harry's wedding to Meghan Markle expected to start earlier that day, and the FA Cup kick off starting at 5.30pm - Wills will have to duck out of the later celebrations and rush the 20 miles from Windsor Castle to Wembley Stadium in time for the trophy ceremony.
The FA released a statement about the clash.
"Everyone at The FA is delighted for HRH Prince Harry and Meghan Markle with the announcement of their wedding at Windsor Castle next year," it read.
"Saturday 19 May promises to be a wonderful day such a special royal occasion being followed by English football's showpiece event, the Emirates FA Cup final at Wembley Stadium.
"With millions coming together to watch both events at home and around the world, it will be a day to celebrate."