By peoplestaff225
Updated August 19, 2007 12:49 AM

Britney Spears‘ former rehabilitation facility, Promises Treatment Center, is the latest to be subpoenaed in the custody battle between Britney, 25, and her ex-husband Kevin Federline, 29.

According to a source familiar with the proceedings, Promises Treatment Center was served with a subpoena Saturday morning. This is the fourth subpoena handed out by Kevin’s legal team. Earlier in the week, Britney’s former assistant Shannon Funk, bodyguard Daimon Shippen, and pal Alli Sims were all served with legal papers.

A source close to the case said,

A spokesperson from Promises refused to comment, saying,

Britney spent a month at Promises and was released on March 21. Her manager at the time said she was ‘successfully’ released.

According to Pepperdine University Law Professor Steven M. Cron, the Kevin’s camp is clearly seeing how Britney took to the Promises stint.

Britney and Kevin married in September 2004 and have two children together, Sean Preston, 23 months and Jayden James, 11 months. The couple’s divorce became final in July of 2007.

Source: People