In a recent interview with “Rolling Stone” magazine, Britney revealed that her two sons had started to add some foul words to their vocabulary. Sean Preston, who is 3 years old and Jayden James, 2, are now using words like “stupid,” while Preston has even learned the F-word, which he says now and then.

Britney Spears said the boys had not learned those foul words from her, blaming her sons’ colorful vocabulary on their father Kevin Federline.

The pop-singer told “Rolling Stone” that she had never used the F-word in front of her children.

Britney has two visits and an overnight with sons Preston and Jayden every week, while the boys spend the rest of the time with Federline, as stipulated by a custody settlement the two reached on July 18, this year.

The decision came after a custody battle that began on November 8, 2006, one day after Spears filed for divorce from Kevin Federline.

In the interview, Britney also said that she was glad her two sons took after her and not after their father, seizing the opportunity to cast the blame for their divorce, as well, on the latter, revealing that she had not expected Federline to leave her.

Spears married Kevin Federline on the night of September 18, 2004, while one year later, on September 14, 2005, the couple’s first child Sean Preston was born. His brother Jayden James was born on September 12, 2006, less than two months before the couple decided to legally part ways.