Princess Eugenies wedding dress will be revealed in all its glory on Friday as she arrives at St Georges Chapel ready to marry fiance Jack Brooksbank.
As is traditional with royal weddings, details surrounding her dress have been kept under wraps.
And its Canadian/Turkish designer Erdem who is the bookies favourite to be Eugenies wedding dress designer.
Ladbrokes have given Erdem odds of 2/1 to be the brains behind the Queens youngest granddaughters bridal gown.
Erdem did have odds of 3/1 last week but this week the fashion house has been cut further, making it even more likely to be the royal contender.
Alex Apati of Ladbrokes said: As the Royals prepare for another wedding its looking increasingly likely Erdem will be Eugenies dress designer of choice in Windsor on Friday.
Ladbrokes latest odds for Princess Eugenie's wedding dress designer
Jenny Packham 6/1
Oscar de la Renta 6/1
Suzanne Neville 10/1
Alice Temperley 10/1
Paule Ka 12/1
Vera Wang 14/1
Ralph and Russo 14/1
Roland Mouret 14/1
Lindka Cierach 25/1
Whatever designer Eugenie goes with, it will have had to have met the Queens approval first.
According to Hello!, the Queens approval of a royal wedding dress before the wedding goes ahead is a tradition.
Its said to be a nice courtesy rather than a necessity, like the way a new Prime Minister has to get the approval of the Queen to form a Government.
The 92-year-old monarch is understood to have also given the go-ahead for Meghan Markles Givenchy gown ahead of her 19 May nuptials to Prince Harry, and Kate Middletons Alexander McQueen design before her 2011 wedding to Prince William.
She is not known to have ever disapproved of a wedding dress design presented to her by a future member of her family.
Eugenie reportedly found and fell in love with her bridal frock at the start of the year, previously telling Vogue UK how it was the first decision she made.
Im not telling anyone who is making it, but I can say it is a British-based designer, she said.
[The dress] is the one thing that I was really decisive about. As soon as we announced the wedding, I knew the designer, and the look, straight away. I never thought Id be the one who knew exactly what I like, but Ive been pretty on top of it.
What did Eugenie's mum, Sarah, Duchess of York, wear on her big day?
Wedding: Prince Andrew and Sarah Ferguson, Duchess Of York
Date: Wednesday 23 July 1986
Sarah Ferguson and Prince Andrew married in July 1986 in Westminster Abbey.
Her dress was designed by Lindka Cierach, her gown was created from duchesse satin and featured heavy beading. 17 feet.
Wedding dress fever had swept the nation so much by this point that copies of Sarahs dress were being sold in stores hours after her wedding.
Click here for a look back at all of the royal wedding dresses since the Queen Mothers wedding to King George VI.