As her custody case rumbles on, Britney Spears may have another issue on her plate - she is reportedly pregnant with her third child.

The alleged father of the baby is music producer JR Rotem, an on-off boyfriend of the Baby One More Time star since she split from husband Kevin Federline in 2006.

The 25-year-old singer told friends she was expecting a third child in a series of emails, according to US tabloid In Touch Weekly, though she later denied the rumours.

A text message sent to KIIS FM host Ryan Seacrest via Spears' friend Sam Lufti this week called the speculation "BS" on Wednesday.

"Don't know who made it up. JR doesn't even know what's up," the message added. "It's fake. Completely fake."

And 32-year-old Rotem released a statement to yesterday saying the pregnancy rumours were untrue.

But In Touch Weekly has today printed photographs of a series of text messages between the magazine and the producer, which appear to corroborate the publication's claims.

When asked if Britney was expecting another baby, Rotem replied: "It's true", with a second text message adding: "No clue on what she will do. She is unpredictable."

The pop princess, whose behaviour is being closely monitored during her child custody battle with former husband Federline, has been described by the judge in the case as a "habitual, frequent and continuous" user of controlled substances and alcohol.

Spears has temporarily lost custody of her children and is currently allowed two visits with her children a week, though she is thought to have won custody of Sean Preston and Jayden James for Christmas Day.

30/11/2007 11:26:43