What will Kate Middleton wear? How will Beckhams make their entrance? What will Beatrice wear on her head? The guests' arrival at Prince Harry and Meghan Markle's wedding is the (second) best bit of the day.
From Pippa Middleon's £495 dress to the arrival of Meghan's LA contingent and Amal Clooney's incredible Stella McCartney creation, there are so many moments we are obsessed with.
The ceremony itself - which will be conducted by Reverend Michael Bruce Curry, the Presiding Bishop of the Episcopal Church and the Reverend David Conner, the Dean of Windsor, with the vows read by Justin Welby, the Archbishop of Canterbury - will start at 12pm, and will last for around an hour. Immediately afterwards, the happy couple will embark on a carriage ride around Windsor, which will take 25 minutes.
But before that, check out all the guests as they arrive...
Earl Spencer and Lady Karen Spencer
Prince Harry's uncle - and Princess Diana's younger brother, with his wife, Lady Karen Spencer.