Britney Spears Is Tops on L.A. Freeway

Britney Spears made sure everyone in the valley knows "It's Britney, bitch" ... sticking half her body out of her G-Wagon while riding down the freeway!!!

Take a look at the photos ... Britney was seen Thursday, dangling her upper body outside the sunroof of her luxury SUV as it traveled down the 101 Freeway ... letting her blond locks blow in the wind, giving motorists a clear view of her famous mug.

Britney was impossible to miss in a cute top ... lookin' good, we might add.

Thing is ... we're told her life is on the upswing these days. One source close to Britney tells TMZ ... the singer is "doing well" and if she was doing this in Louisiana it would be considered "good clean fun."

Britney, obviously, isn't driving the car ... because she is currently unable to drive after striking a plea deal back in May that reduced her DUI charge to a "Wet Reckless" which resulted in 12 months' probation.