Eugenie's fiancé Jack has asked his brother, Thomas Brooksbank, to be Best Man.
Royalists in Australia will be able to view live coverage from inside St. George's Chapel from 7pm on Friday, October 12.
Also taking up the role of bridesmaids will be Savannah and Isla Phillips, the daughters of Peter and Autumn Phillips.
'It has been lovely working with Princess Eugenie and Jack and I really hope they enjoy the cake on the day'.More news: 50-Foot-Tall Ice Spikes Cover Europa, New Study Suggests | Planetary Science
Former "Take That" star Williams and Field are friends with Eugenie and her sister Princess Beatrice, and are expected to attend the wedding, British newspapers reported.
Five-year-old Maud Windsor, the granddaughter of Prince and Princess Michael of Kent, has also been asked to be a bridesmaid.
And while Princess Eugenie and Jack Brooksbank wedding is set to be a totally different event (it's a two-day affair with a funfair on Saturday), we'd say the royal family are getting pretty excited.
Princess Eugenie and Jack Brooksbank will marry on Friday evening, Australian time. (AAP) Mia Tindall, Zara and Mike Tindall's four-year-old daughter, will be a bridesmaid.More news: Five killed in torrential rainstorms in Majorca
It's the same venue where Prince Harry and Meghan Markle - now The Duke and Duchess of Sussex - tied the knot in May.
The couple will then take a short carriage trip through Windsor, echoing that of Harry and Meghan when huge crowds turned out to watch.
Princess Eugenie and Mr Brooksbank met at the Swiss resort of Verbier where Eugenie was on a family vacation celebrating her father's 50th birthday.
According to BBC News, 1,200 members of the public have been invited to the wedding at Windsor Castle.
Robbie Williams' daughter will be a bridesmaid at Princess Eugenie's wedding.More news: Trouble for Hubble: gyro fails on space telescope
- Germany coach Low dismisses Klopp criticism of 'senseless' UEFA Nations League
- Acute flaccid myelitis cases investigated across state
- Sears is preparing for bankruptcy as soon as this weekend
- 'Gay cake' case: Supreme Court rules Ashers did not discriminate against customer
- China is the key to beating climate change
- Google drops out of Pentagon's $10 billion cloud competition
- BrettKavanaugh.com links to resources for sexual assault survivors
- Trump apologizes to Kavanaugh and declares him 'proven innocent'
- You Need To Watch Cardi B's OTT American Music Awards Performance
- New NES Games Now Available