The actress and the actor - who have been together for around nine months after rekindling their romance - are trying to decide where to tie the knot and although Jude is keen to marry abroad Sienna seemingly has her heart set on a big ceremony in England.
A source said: "They are very happy and want to get married. But they are still undecided about where to tie the knot. She loves the idea of an English country wedding, but Jude wants as much privacy as possible and thinks a small wedding abroad would be better."
Sienna was recently seen walking around Vaudelnay in the Loire Valley - where Jude's parents live - holding a "wedding file", leading to speculation that would be the location for the big day.
The pair have previously been engaged but ended their relationship in 2005 after it was revealed Jude was having an affair with his children's nanny Daisy Wright. But they got back together in October 2009 and are now set to say "I do".