Royals and other guests arrive at the church.
Royal Mug Gaffe
According to this commemorative mug brought out to celebrate the Royal wedding it's Prince Harry wedding Kate Middleton!
Beaming out from the side of the mug, alongside Kate Middleton, is her future brother-in-law Prince Harry.
On the back, an inscription reads: "The fairytale romantic union of all the centuries. 29th April 2011."
It's not clear whether it is a gaffe, a deliberate spoof or a very clever marketing ploy.
The mug, supposedly designed by a Chinese firm Guandong Enterprises, can be purchased for £9.99 plus postage and packaging.
"Crafted in the finest bone china, it features an exquisite design of the happy couple with ornate gold detailing to honour this great moment in history," the company boasts on its website.
It's Pippa Middleton's big day - here's everything you need to know...
Think you've got all the facts you need from The Crown on Netflix? THINK AGAIN! Here's the ultimate guide to the royal family tree...
How much would you blow on your Big Day? When it comes to splashing the cash on the most important day of your life, these stars definitely know the deal.
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...