Britney Spears' trip to the drug store is anything but ordinary to trailing paparazzi. The troubled pop star has been spotted shopping for a pregnancy test kit at a local Rite Aid Tuesday.

The 26-year-old mother of two was accompanied by photographer boyfriend Adnan Ghalib, whom she was rumored to be engaged to after she was seen wearing a diamond ring. The photos at Rite Aid had been released by Ghalib's own agency, FinalPixx.

Sources say Spears is desperate for another baby because she needs to fill the gap when she lost custody of her two sons to ex husband Kevin Federline.

"Britney hates when things are taken from her. The court's taken Preston and Jayden away, so she'll just have another kid to take their place. That's the way she sees things," a source says.

Spears had been stripped off of her visitation rights after an altercation with the police on January 3 when she refused to return the kids to Federline.

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