The wedding will feature music by singer Andrea Bocelli and the Royal Philharmonic Orchestra, while guests at the reception will enjoy a cake by London-based cake-maker Sophie Cabot.
And with the presence of so many royals - and a number of celebrity guests - extra security measures have been put in place.
The former couple started dating in 2004 and Wednesday in a beachfront ceremony in Jamaica in 2011.
Ahead of their big day they spoke in a television interview about how they first met while on holiday in Switzerland at a mutual friend's home.
"Honestly with all the controversy in my family, all I wanted to do was show my support", Dooley said. Doria, a yoga teacher and social worker, is now based in Los Angeles, but regularly flies to the United Kingdom to visit her daughter.
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They lived in LA together at the start of their marriage but Meghan then moved to Toronto to film legal drama Suits in which she played Rachel Zane.
Mr Brooksbank described his future wife as a "bright shining light".
Fans hoping for some fun-filled antics from the young helpers in the bridal party, will be pleased to see Zara and Mike Tindall's spirited four-year-old Mia and Peter and Autumn Phillips' daughters Savannah and Isla are slated for headline appearances.
Eugenie's sister, Princess Beatrice, will read a passage from "The Great Gatsby".
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The carriage procession after the ceremony will also be aired. The Archbishop of York has written a prayer for the couple.
Starting from 7.00 p.m AEDT, network stars Michael Usher and Edwina Bartholomew will commentate on the event from the studio before crossing live to St George's Chapel at Windsor Castle.
He described the Queen's granddaughter and her fiancé as the "perfect couple" after giving them the traditional pre-marital guidance.
"So that's one really important one".
Eugenie, 28, is ninth in line to the British throne.
In an exclusive chat with Jackson, he revealed to PureWow that he photographed the cake being made yesterday morning in the kitchen at Buckingham Palace.
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