The 'Toxic' singer reportedly fell for rocker Jason at her Alcoholic Anonymous meetings, and Jason has revealed they are "growing close".
Jason told gossip website TMZ: "I love her, I support her 100 per cent and we are close. We have been growing very close since our special relationship began.
"
While Jason refused to confirm or deny if he is dating Britney, he is helping the troubled singer with the "spiritually deep" part of her treatment.
The 33-year-old also revealed he knew Britney before she checked into Malibu 's Promises centre.
Jason says they kept in touch before meeting up again at a Los Angeles Alcoholics Anonymous meeting last month.
Meanwhile, it has been reported Britney, 25, has been displaying some diva-like behaviour in rehab.
A source told America's Star magazine: "Britney has a seriously bad attitude problem. She's been very demanding.
She acts like a 12-year-old and throws
temper tantrums when she doesn't get what she wants.
"She refuses to pick up after herself and even asked if she could hire a maid! She's asking for special food, special everything and she's not that nice to anyone.
"
The magazine also claims Britney has been drinking 24 cans of Coca-Cola a day.
