Britney Spears is reportedly annoying counsellors and managers at the Promises Treatment Center in Malibu by not attending daily group therapy sessions and breaking the facility’s rules.

A source to Us Weekly: “She has been getting in tons of trouble. [She’s] been reprimanded for making cell phone calls, has left the facility to shop, and now she wants to leave rehab for good.”

But, the source added, she feels justified not attending the therapy sessions because she feels she’s being treated for the wrong thing there: “She’s convinced she’s suffering from postpartum depression and does not think she has an alcohol or drug problem.”

“She’s angry at her family and her manager for pressuring her to enter the program. She feels she was ambushed.”

Britney last left the facility on Tuesday night when she was reportedly given permission by doctors to visit her sons Sean and Jayden. Onlookers report that she spent around two hours with the boys, and estranged husband Kevin Federline, at her Malibu home.

A source close to Kevin told People magazine that Kevin is working with Britney’s mum, Lynne Spears, to ensure that the boys are taken care of during Britney’s time in rehab so that she doesn’t have to worry about them.

The source said: “Everyone is making comments how sad it is that it took this to get everyone together. There was a lot of distance between the families but it seems now they all have a common goal, which is to help Britney get better.”