Happy birthday, Britney Spears!

The pop tart turns 28 today in the company of boyfriend Jason Trawick.

A be-spectacled birthday girl and her bleached-blond man kicked things off with a shopping trip to Fred Segal.

She didn't seem particularly festive on the outing, even as the paparazzi sang her "Happy Birthday" as she exited the store. Maybe Brit-Brit's learned to hold back a little this year?

Although she seemed somber today, the singer paid homage to her Southern roots while partying last night...

Brit and Jason hit up Saddle Ranch Chop House, a Western-themed tourist haunt on the Sunset Strip complete with a mechanical bull.

Afterward, the twosome checked into the Mondrian Hotel across the street.

As for how she'll celebrate tonight? According to a source, she's having a party at a private estate with her close family and friends. We're guessing paps won't be invited!


See more stars celebrating birthdays in our gallery!

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