To protect Britney Spears against her former manager, Sam Lutfi, her Internet and cell phone use is being closely watched.

The "X Factor" judge has been under a conservatorship for more than four years, and her conservators -- which include her father Jamie Spears -- are going to great lengths to make sure Lutfi does not communicate with Britney.

Lutfi is suing Britney and her parents, Jamie and Lynne Spears, for defamation and breach of contract. Lufti is particularly angry about Lynne's negative depiction of him in her book, "Through The Storm", that discussed his role in Britney's public meltdown. 

Lutfi's restraining order on behalf of Britney and her children expired earlier this year so "the conservators went to extra lengths to make sure that Sam wasn't able to contact Britney because there was no longer any criminal threat if he were to violate terms of the restraining order," a RadarOnline source said. 

"Britney's cell phone and Internet use is restricted and heavily monitored, and this is done for her protection," a RadarOnline source said. "Britney's father, Jamie, and her fiance, Jason, want to make sure that her former manager, Sam Lutfi, isn't able to contact her. Britney and Jason essentially share a cell phone, and it's routinely checked to see who has been calling. Furthermore, the cell phones have been programmed to block calls from phone numbers associated with Lutfi. Brit's computer usage is also restricted in the sense that certain websites are blocked. Her family doesn't want Britney reading negative stories that would upset her. Again, this is all done with love and for her well-being." 

Her fiance Jason Trawick, both her parents, talent agent Kevin Huvane and current manager Larry Rudolph are anticipated to take the stand against Lufti in the upcoming trial. Other witnesses expected to testify include Britney's former assistant Ali Sims, former manager Lou Taylor, who has worked with her for many years, and other lawyers including Laura Wasser, who represented Britney in divorce proceedings against Kevin Federline.

Britney, however, will not be testifying,

According to documents obtained by RadarOnline, the defense's opening statement will be: "This case was filed by Plaintiff Sam Lutfi against Defendants Lynne Irene Spears, James Parnell Spears, and their daughter Britney Jean Spears in February 2009. In 2008, the Los Angeles Superior Court ordered that a conservatorship be established for Britney. The conservatorship continues to the present; thus, she is under the supervision and control of the court. As a conservatee, Britney is not allowed by law to defend herself. The court has directed her to be defended by her two Co-Conservators, Andrew Wallet and Mr. Spears."

Tags: Britney Spears