The 'Toxic' singer delivered her second son at the Cedars-Sinai Medical Center, in Los Angeles, just before 2am on Tuesday (12.09.06).
According to gossip website perezhilton.com, Britney gave the tot - who weighed in at a healthy 6lb 11oz - the name so he has the same initials as his older brother Sean Preston Federline .

The boys also (almost) share a birthday – Sean Preston turned 1 on Thursday, just two days after his brother was born.

Sutton Pierce has two half-siblings as well: sister Kori, 4, and brother Kaleb, 2, his dad's kids with actress Shar Jackson.

Meanwhile, it has been claimed that Britney gave birth in the same room as her hero - Madonna.
A source from inside the hospital says the Caesarean section took place in the same VIP suite in which Madonna gave birth to her and her husband Guy Ritchie's son Rocco.
The 25-year-old pop beauty has always named Madonna as her musical inspiration.
The pair dueted on the hit single 'Me Against the Music' and also shared a lesbian kiss at the 2003 MTV Video Music Awards.
The hospital insider also revealed that actresses Jennifer Garner and Kim Basinger delivered their babies in the same suite.