Britney Spears and Kevin Federline have welcomed their second son together, a source close the family has confirmed to PEOPLE.
The baby boy, who was born just before 2 a.m. Tuesday at a Los Angeles hospital, was delivered via a scheduled C-section.
"Kevin had a smile on his face. He looked happy and upbeat," says an observer.
The whole thing, says a source, was smooth – just as the mom-to-be had predicted to PEOPLE back in August, saying childbirth "will be a piece of cake."
Spears, 24, and Federline, 28, already have a son, Sean Preston, who was born Sept. 14 last year. For Federline, the new arrival is his fourth child. He also has a daughter Kori, 4, and son Kaleb, 2, with actress Shar Jackson.
Spears first publicly confirmed this pregnancy during a May 9 visit to the Late Show with David Letterman. "Don't worry, Dave, it's not yours," she joked to the host, who responded: "Oh. Well, I think that's good news for both of us."
The birth of their second child comes as Spears and Federline celebrate their second anniversary: The couple wed on Sept. 18, 2004. The pair began talking about starting a family soon after. "I can see myself as a mom. Next year at 23, I am so there," she told PEOPLE shortly after the wedding.
Just four days short of the couple's first wedding anniversary, she had accomplished that goal by having Sean Preston.
The timing of baby No. 2's arrival may have been a surprise – Spears has said the pregnancy wasn't planned – but expanding her brood was never a question for the domesticity-craving pop star. Sean Preston "is going to be traveling on the road with me, so I think it will be good to have (a sibling) there with him," she told PEOPLE last month.
For Federline's part, the aspiring rapper told PEOPLE after his performance at the Teen Choice Awards last month, that he planned to take time off until after the baby was born. "I'm really going to kick back and wait and see when this baby is going to come, spend my time with my family and my wife," he said.
As for being pregnant a second time so quickly after the first, Spears said she's been happy to indulge her cravings for ice chips and chocolate, but having gained some 40 lbs., has also been frustrated at not having time to get back into the shape she was before becoming a mom. "I feel like I've been pregnant for 10 years!" she said.
Spears vowed that after the birth of her second child she'd get back to the gym – and back to work. "I'm definitely going to start working out in a huge way," she told PEOPLE last month.
Plus, the singer, whose last original album was 2003's In the Zone, is working on a new album due next year, which she describes as "cooler than ever – fun, upbeat and sexy."
MTV.com: Britney Spears gave birth to her second child late on Monday night, a source close to the family confirmed to MTV News, but whether it is a boy or a girl has yet to be officially revealed. Both Us Weekly and The National Enquirer have reported the baby to be a boy. Spears' rep, however, dismissed the reports as "speculation."
Although it was never officially confirmed, Spears was expected to give birth later this week; reports circulated that she would have labor induced on Thursday in order to prepare for a cesarean birth. The birth of Spears' first son last year was also a cesarean. Rumors that Spears went into labor last week were promptly debunked after photographs of the singer driving to Taco Bell on Thursday surfaced. The singer was also photographed taking her son Sean Preston for a drive with her around Malibu, California, in her white Mercedes on Monday.
Spears discovered she was pregnant for the second time in early February, but waited until early May to confirm the news during an appearance on CBS' "The Late Show with David Letterman." The birth marks Spears' second and her husband Kevin Federline's fourth child; Federline already has two children with former girlfriend Shar Jackson: 4-year-old Kori and 2-year-old Kaleb.
TMZ.com: Britney Spears has reportedly given birth to her second child, a boy, at Cedars-Sinai Medical Center in Los Angeles. While there hasn't been an official confirmation from her camp, numerous sources are offering up information as to how the happy occasion went down.
According to a source, Brit checked in to the hospital under an assumed name -- using the first name Pebbles -- last evening. The baby was delivered by Cesarean section at shortly after 2:00 a.m., weighed in at 6 lbs. 11 oz and was 19 inches long.
Our source indicates she deliberately led everyone to believe it was a girl but always knew she was having a boy.
AccessHollywood.com: LOS ANGELES, Calif. (September 12, 2006) -- Access Hollywood welcomes Britney's new baby boy to the world!
Sean Preston will reach the tender age of 1 on Thursday, and now he has a baby brother -- mother Britney has reportedly given birth again.
And yes folks, that would make Kevin Federline a father four times over! He also has a four-year-old girl, Kori, and a two-year-old son, Kaleb, from a previous relationship with Shar Jackson.
Britney reportedly delivered a 6 lb, 11 oz baby boy, via C-section, just before 2 AM this morning. Federline reportedly took her to the hospital last night to prepare for her C-Section surgery. Sean Preston was also born via C-section, almost a year ago.
According to reports, Kevin was joined at Britney's bedside by Britney's mom, Lynne, and her sister, Jamie Lynne. No one from Kevin's family was present.
Britney Spears, expecting baby No. 2, said recently to PEOPLE magazine that she and husband Kevin Federline didn't plan the pregnancy. "It just kind of happened," the 24-year-old singer revealed to PEOPLE magazine in a recent interview.
She added, laughing: "I'm going to wait a while for the next (one)!"