Posted on 30th July 2008 08:00AMJennifer Aniston and John Mayer are planning a "trial marriage".
The couple - who have been dating for three months - are said to be keen to test the strength of their relationship, and think John moving into Jennifer's house is the perfect first step.
A source said: "John wants to settle down as much as Jennifer does.
"What's more, he's been telling her that he thinks she is the one and she believes him."
John's move into Jennifer's Beverly Hills mansion is set to happen after his tour ends in September.
The couple are also reportedly planning a family.
The source added to Britain's Grazia magazine: "John is the first guy since Brad who has talked seriously about having children and Jennifer is very excited about it."
Jennifer was previously married to Brad Pitt for five years. They separated in 2005 amid allegations he was cheating on her with actress Angelina Jolie, with who he now has six children.
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