Britney Spears celebrated her 28th birthday on Wednesday surrounded by the men in her life – boyfriend Jason Trawick and sons Preston and Jayden.

The singer and her agent beau Trawick, 37, started the celebration a day early Tuesday night at L.A.’s Mondrian hotel, where Spears also enjoyed spa services, a source tells PEOPLE.

That night, the couple went to the Sunset strip, visiting both the Saddleback Ranch restaurant and Chateau Marmont. The next day, they shopped at West Hollywood’s Fred Segal boutique before reuniting with the pop star’s sons Preston, 3, and Jayden, 2, at her home in Calabasas.

“Britney looked so happy,” says an eyewitness. “She seemed very excited to spend her morning with Jason.”

Spears was also thrilled to get to be with her two boys on her B-day, says another source. “Britney is very happy to spend the day with Preston and Jayden. The kids know it’s her birthday … [They] are very excited about Britney’s cake too.”

While Spears hung with her sons at home, ex-husband Kevin Federline celebrated his girlfriend Victoria Prince’s birthday – which happens to fall on the same day as Spears’s.

Federline, 31, and Prince, 27, had a late lunch at a Mexican restaurant. “She looked very pretty when she arrived for her bash,” says an observer.

Federline, who sources says has lost about 30 lbs. since joining the cast of VH1’s upcoming Celebrity Fit Club, “joked how it’s about time he gets some proper food,” according to an eyewitness.

Source: People Magazine

Today is Britney’s 28th birthday!

It’s shocking to think that just two years ago she celebrated her birthday with Sam and Ali. Since then she’s released a number one selling album, had two Billboard number one hit singles and had the biggest female solo tour of the year in the US. Let’s hope the good things continue to come for her!

Happy Birthday!

Not all the bad news out of Australia about Britney Spears is true.

Although she was in fact embroiled in a lip-syncing controversy, reports that her agent-boyfriend Jason Trawick abruptly left the country after rejecting her wedding proposal are “100 percent absolutely false,” says a source close to the couple. “There was no proposal and they were never engaged.”

The couple of more than six months had spent time together across Australia with her two boys, Preston and Jayden, while Spears performed on stops of her Circus tour. When Trawick headed back to L.A. instead of spending the holidays it was simply a matter of logistics. “Jason spent more time in Australia than originally planned,” says the source. “They are very happy.”

Source: People Magazine