Prince Harry's aunt is at his wedding. She wasn't invited to William's nuptials.

Wearing Household Cavalry uniform, Prince Harry has arrived for his wedding day.

He is accompanied by his brother and best man, Prince William, who is also wearing a cavalry uniform.

Both are wearing the frockcoat uniform of the Blues and Royals -- a cavalry regiment of the British Army. The frockcoats are for those with the rank of Major, and they have large gold embroidered crowns on them.

Fun fact: The Queen had to give her permission for Harry to get married in his uniform.