Reese Witherspoon and Jake Gyllenhaal have moved in together.
Jake recently moved into Reese's $5 million Los Angeles home fuelling rumours the couple are planning to wed.
A source said: "Marriage is definitely what they are working toward."
The pair have become so close Jake is even helping raise Reese's two children - eight-year-old Ava and four-year-old Deacon - from her marriage to Ryan Phillippe.
A friend of Reese's added to Us Weekly magazine: "They literally don't want to spend any time away from each other."
Oscar-winner Reese and Brokeback Mountain star Jake have been dating for a year after meeting on the set of the film Rendition.
Although they initially denied rumours they were an item, they eventually went public last October after they were seen enjoying a romantic weekend break in Rome.
Reese had filed for divorce from Ryan the year before citing irreconcilable differences.
She has previously spoken of the emotional breakdown she suffered when her marriage ended, while Ryan has claimed the divorce was the "most personally devastating time" in his life.
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