John Mayer will propose to Jennifer Aniston on her 40th birthday next month, a new tabloid scoop claims.

The “Clarity” star will ask Jenn to marry him when she turns 40 on February 11, and has invested in a custom made engagement ring for her.

A source told Star Magazine: “Money’s no object for John. He didn’t want to buy something that anyone else had, so he sketched it and is having it custom-made.”