Britney Spears and husband Kevin Federline reportedly had a screaming match in a Los Angeles cinema.

The pair - whose marriage has been on the rocks since the birth of their first child Sean Preston four months ago - were allegedly spotted rowing when they went to see new movie "Memoirs of a Geisha."

A source told America's New York Post: "Kev spent the whole time on the phone. Then they had a fight when he tried to leave early."

However the singer's representative said: "Believe it or not, Britney and Kevin are just like other couples - they fight and they make up."

Meanwhile the pop babe is suing American magazine US Weekly for claiming she and Federline made a raunchy sex tape.

Britney has filed a $10 million suit, claiming the story was an "outrageous fabrication."

The article ran under the headline: "Brit & Kev: Secret Sex Tape? New parents have a new worry: racy footage from 2004."

The magazine said the couple had been approached by a member of their entourage who was threatening to release steamy footage of them. Britney was reported as saying she was worried "an X-rated tape starring the two may go public."