The A list couple are thought to be planning to tie the knot in France on June 29, the same weekend as Glastonbury festival.
A new report from The Sun suggests that the stars could give Jonas’ younger brother Nick and wife Priyanka Chopra – who hosted a series of lavish wedding celebrations around the world last year – a run for their money.
“They plan several parties across four days and one will be an outdoor festival,” a source told the publication.
“They have been contacting some of their favourite artists to ensure it’s a star-studded affair.”
The insider suggests that the star-studded guest list will feature “friends, family and lots of Sophie’s co-stars,” with the event promising to be “a Game of Thrones reunion”.
“There will be a family brunch the day after the wedding, as well as the festival. It will be luxurious and the drinks will be flowing,” they added.
Standard Online has contacted representatives for Turner and Jonas for further comment.
Speaking at the series eight premiere of Game of Thrones, Turner revealed that her co-star Maisie Williams is set to take the role of maid of honour at the event.
Joking that Williams didn’t need to “think about” what she’ll wear to the wedding as she will be “giving her the bridesmaid dress,” Turner said: “She’s my maid of honour. One of two.”
The pair previously attended the wedding of co-stars Kit Harington and Rose Leslie last June, along with fellow Game of Thrones alumnae Emilia Clarke, Peter Dinklage and Richard Madden.