Jennifer Aniston and John Mayer Plan "Trial Marriage"

Jennifer Aniston and John Mayer are reportedly planning a "trial marriage".

The pair -- who have been dating for three months -- are so keen to test the strength of their relationship that John is set to move into Jennifer's house.

A source says, "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 British magazine Grazia, "John is the first guy since Brad who has talked seriously about having children and Jennifer is very excited about it."

Jennifer, 39, was previously married to Brad Pitt for five years. They separated in 2005 amid allegations the Fight Club actor was cheating on her with actress Angelina Jolie, with who he now has six children. The media also speculated that the split was due to Aniston's refusal to have children. However, the former Friends star denied the reports.

In a 2005 interview with Vanity Fair magazine, she said, "I've never in my life said I didn't want to have children... I've always wanted to have children, and I would never give up that experience for a career."

Mayer, 30, has dated a string of famous women over the past few years, including Jennifer Love Hewitt and Jessica Simpson.