Princess Eugenie's royal wedding preparation includes a major new hair do.

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Princess Eugenie will be channelling her mother Sarah Ferguson when she walks down the aisle today.

While most brides are advised to avoid any major beauty changes/treatments the day before their wedding, Princess Eugenie decided to make a bold change to her hair by dying it red.

Less than 24 hours before her royal wedding to Jack Brooksbank, the princess was spotted in London with a brand new hair colour (and spray tan).

Express have published the photos of Eugenie in London, which you can see here.

Prince Eugenie's mother Sarah Ferguson is famous for her fiery red hair, so her big change from brunette to red may be a nod to her mum.

Regardless of her reasons, Eugenie's new hair style will look amazing with her royal wedding gown and tiara, of course.

Princess Eugenie and Jack Brooksbank will be married in St George's Chapel, Windsor Castle, on Friday.

More than 800 guests will gather in the 15th-century Gothic chapel, five months after the Duke and Duchess of Sussex Prince Harry and Meghan Markle staged their star-studded nuptials in the same venue.

Australians can watch the entire ceremony live from 7pm on Channel Seven at 7TWO on Friday 12 October... Hopefully the celebrant gets their names right.