The Saturdays singer and her soccer player fiancé are planning an extravagant summer ceremony with the help of Bentley's Entertainments, the firm that organised Victoria and David Beckham's lavish bash in 1999.
According to heat magazine, the wedding will take place in July at Wolburn Abbey in Bedfordshire, East England, and no expense is being spared for the guests, who will stay at the nearby Wolburn hotel.
And in order to protect their privacy, the couple - who have eight-month-old son Parker together - have asked those in attendance not to share their photographs of the big day online.
An insider told heat magazine: ''Frankie and Wayne want to keep the ceremony as private as possible. Cameras are allowed, but they have requested that no pictures are posted on social media.''
Frankie and Wayne have also asked their family and friends to make donations to mental health charity MIND, of which they both became patrons following Frankie' s battle with depression, instead of buying them wedding gifts.
There's already an Oscars buzz surrounding this movie.