Prince Harry has arrived at Windsor Castle with his brother and best man Prince William.
The groom and The Duke of Cambridge both wore the frockcoat uniform of the Blues and Royals.
Harry waved to the crowds of people before stepping into St George’s Chapel.
It was announced in April that Harry had asked William to be his best man at his wedding to Meghan.
The Duke of Cambridge said he was “honoured” to be asked to stand with Harry as he marries Meghan.
A statement from Kensington Palace said: “Prince Harry has asked his brother The Duke of Cambridge to be his Best Man at his wedding to Ms. Meghan Markle.
“Prince Harry served as best man to The Duke of Cambridge at his wedding to Miss Catherine Middleton in 2011.
“The Duke of Cambridge is honoured to have been asked, and is very much looking forward to supporting his brother at St George’s Chapel, Windsor on May 19th.”
Meghan and Harry’s ceremony will begin at noon.
The couple’s guests began to arrive at around 11 am.
George and Amal Clooney, Elton John and David and Victoria Beckham are just among the celebs that have arrived so far.
Prince Harry’s ex-girlfriend Chesly Davy has also arrived at Windsor Castle.
Cressida Bonas has also entered the grounds of Windsor Castle.
Read more: 2018 Royal Wedding Guide
The bride is expected to arrive at the Chapel around 12pm.
The car carrying Meghan and her mother Doria has already entered the grounds of Windsor Castle.
Onlookers managed to get a sneaky peek of what the former actress is wearing.
Through the car window, it seems she is wearing a full veil, with a dress featuring long sleeves and a bateau neckline.