The 'Toxic' hitmaker began dating her former agent in 2010 and though she is reluctant to divulge details of their relationship, her fiance claimed the 'x factor' judge made the first move.
Jason said: ''It was kind of one of those things where she moved, like, turned around, so we were face-to-face and then ... ''
However, Britney interrupted him to say: ''OK, that's enough information, sweetie. It was sweet, just say that.''
Despite her high-profile, Britney - who has sons Sean Preston, six, and Jayden James, five, with ex-husband Kevin Federline - insists she never pays attention to anything that has been written about her.
She told the October issue of America's ELLE magazine: ''I guess I've been under the microscope so long that I don't even pay attention to the nonsense anymore.
''I gave up getting upset about things people make up about me a long time ago.''
And the 30-year-old beauty also admitted she is a ''tomboy'' who can't always be bothered to dress up to go out in public - something she later regrets.
She said: I love my jeans and my sweats - I'm really just a tomboy at heart. So it's really hard for me to be like Kim Kardashian and be make-up and hair ready every time I go out of my house.
''I'm not a believer in that, you know?
''When you do wear those sweats, you're like 'Oh God, I should step it up a Notch.' ''