And, when they walk into Fleet Street's St. Bride's Church, media owner Murdoch, 84, and model Hall, 59, will already be married – as they are having the civil ceremony elsewhere beforehand.
According to Rev. Canon Dr. Alison Joyce, who will lead the nuptials at the Baroque church, the couple has put together a service that "means a great deal to them both," and will see their children taking part.
Hall has four children from her relationship with Rolling Stone Mick Jagger – Georgia May, 24, Elizabeth, 32, Gabriel, 18, and the recently-married James, 30 – while Murdoch has six from his two previous marriages: Prudence, James, 43, Lachlan, 44, Elisabeth, 47, Helen, 14, and Chloe, 12.
"It will be a service of prayer and blessing at which they will give thanks for their marriage, and renew their marriage vows before God," Canon Joyce tells PEOPLE of the couple's thanksgiving service (note: that's with a lowercase "T").
The couple, who announced their engagement in January, are keeping many of the details private, but Canon Joyce says, "The service will contain three well-known traditional hymns, as well as readings, and choir items."
She adds, "It will be very much a family event for both of them, as their sons and daughters will be fully involved, which is very nice."
The church's "outstanding professional choir" of 12 men and women, who are all soloists in their own right, will lead the singing and assisting Canon Joyce will be Fr. Jonathan Morris from New York – who has done some work for Murdoch's Fox News.
Australia-born Murdoch isn't just associated with Fox – his company owns the New York Post, Wall Street Journal and several British newspapers including The Times and The Sun.
Canon Joyce is well aware of the significance of the setting:
"Rupert Murdoch has significant personal links with St. Bride's – there is a memorial plaque to his late father [Sir Keith Murdoch] here – and he has attended services here, from time to time, for many years, so in many ways St. Bride's is a natural choice for the service for him," she says.
St. Bride's links with the world of printing and newspapers go back more than 500 years, when a printing press was set up alongside it. The first national newspaper followed in 1702. The church, which was completed in 1703, was originally known as the "Printers' Church."
"Gradually, our ministry evolved to include journalists, their support staff, proprietors and everyone else in the media," explains Canon Joyce.
And it is the perfect location, for pastoral reasons too. "Aside from being an exquisitely beautiful historic church, its relatively small size and 'open' layout mean that we can hold services that manage to combine a sense of formality with one of intimacy."