Pop superstar Britney Spears filed for divorce on Tuesday from dancer Kevin Federline after two years of marriage and two months after the birth of their second child.

Blond sex kitten Spears, 24, cited irreconcilable differences on her divorce petition, which was filed in Los Angeles Superior Court and made public by celebrity Web site TMZ.com.

Spears asked for sole custody of her two sons with Federline, one-year-old Sean Preston, and James Jayden, born on September 12. She asked for Federline to be given visitation rights.

Spears filed the papers after a brief appearance on "The Late Show with David Letterman" on Monday night in which she showed off her svelte new post-pregnancy figure but gave no hint of her separation from Federline, 28.

Rumors that the marriage was rocky had been circulating for months. Spears denied she was estranged from her husband, however, saying he had helped her weather the ups and downs of her second pregnancy.

In July, The National Enquirer celebrity magazine apologized to Spears in its British edition for reporting that the pop star was ready to divorce Federline.

"We now accept that their marriage is not over and they are not getting divorced," the British National Enquirer added.

Spears shot to fame in 1999 and has sold more than 60 million albums to become one of the best-known celebrities in the world. Federline, a dancer and aspiring rap artist, has two other children by his former girlfriend, actress Shar Jackson.

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