Pop star Britney Spears, 22, has married for the second time.

Spears, wearing a white strapless dress, married 26-year-old boyfriend and backup dancer Kevin Federline late Saturday during a private ceremony at a friend's home in Studio City, California, according to reports.

The singer had married high school friend Jason Alexander in Las Vegas, Nevada, in January.

The marriage lasted 55 hours before the pair obtained an annulment.

Federline has two children -- two-year-old daughter Kori and newborn Moesha -- from his first marriage to actress Shar Jackson.