Pop princess Britney Spears is due to give birth in September, one month earlier than the originally date. Her sister, Jamie-Lynn, confirmed the rumor, but didn't comment if Britney is expecting twins. There was also no information about the sex of the baby.

Jamie-Lynn, 14, moved to Los Angeles with her mother Lynne, to be close to the star when the baby arrives. "I get to spend a lot of time with Britney. We are getting ready for the new baby's arrival in September. I can't wait. I have been shopping so much for the baby and it is not even here yet."

Meanwhile, Britney's relation with her mother doesn't look so good. On the set of of Zoey 101, the TV show staring Britney Spears's younger sister Jamie Lynn, the two Spears women started to fight about what appears to be an older conflict in the family, about Britney's father.

An insider confessed: "Britney was screaming at her mom. She was furious, swearing and cursing. Her mom burst into tears at one point but Britney didn't seem to care or notice."

Britney began yelling at her, saying that her father [Jamie, 52] was sometimes not there for her and that Kevin will be the best father for her baby," the witness said.

"Britney's mom got really upset and began to cry. She told Britney Spears that her father does love her and that he did the best he could for the children.

But Britney just wouldn't listen. She got into her car and sped off, screaming 'F**k you, momma! 'Everyone was really shocked and stunned."