New York, Dec 23 (IANS) Troubled pop superstar Britney Spears is blaming her mom Lynne Spears for the pregnancy of her 16-year old sister Jamie Lynn.

Britney called up her mom after she heard of the pregnancy and they spoke for a long time with Spears doing most of the talking, Pagesix.com reported.

An inside source said: 'Britney basically went off on her the entire time, blaming her for Jamie Lynn's messed up life. It was a very hurtful call.'

Britney and her mom have been estranged when her family forced her to go to rehabilitation against her will. The source added: 'Britney feels like they have all abandoned her in her time of need. She felt, and still feels, completely left out of the family.'

Spears is not allowing her parents to see her children.

The source added: 'Because Lynne has been refused visits with Britney when she has the boys, Lynne will make sure she has more control over Jamie Lynn's baby. Britney needs to get over her petty family issues. She needs to get help with her issues so that she can be a part of not only Jamie Lynn and her baby's life but her own boys' lives as well.'