Britney Spears has become an aunt, after her younger sister Jamie Lynn Spears gave birth to a baby girl.

The baby was named Maddie Briann and weighed 3.49 kilograms, according to a friend of the Spears family. The father is Casey Aldridge, a pipe-layer from Liberty, Mississippi. The couple is not married but announced an engagement several months ago.

The Spearses had not yet announced the baby's birth. All we know is that Spears gave birth at a south Mississippi hospital.

Nickelodeon issued a statement about the birth, saying: "We wish her and her family well."

Spears starred in Nickelodeon's Zoey 101 children's TV series.

"We understand everybody's interested, but we don't give out information on anyone. Everyone's entitled to their privacy," she said.

The Spears family announced in December that 17-year-old Jamie Lynn was pregnant.