Hollywood couple Jennifer Aniston and John Mayer are planning a “trial marriage” after just three months of dating.

The notorious womanizer and the popular screen star will test the strength of their relationship by moving in to Jenn’s mansion together when John’s tour wraps up in September.

“John wants to settle down as much as Jennifer does,” an insider tells Grazia Magazine. “What’s more, he’s been telling her that he thinks she is the one and she believes him. John is the first guy since Brad who has talked seriously about having children and Jennifer is very excited about it.”