Pop singer Britney once again is sparking new baby rumors that she is expecting with her on/off boyfriend Adnan Ghalib, after she was seen sporting a bulging belly while out shopping in Los Angeles.The pop star has been dogged by reports she is pregnant with her third child since the couple were spotted buying pregnancy tests last January.Last week more speculation mounted as it emerged paparazzo Ghalib has been bragging to friends that he has succeeded in his goal to get Spears pregnant.And new photos of the Toxic singer, taken on Wednesday, appear to show that Spears is, indeed, pregnant as she shows off a more shapely figure in a form-fitting white T-shirt and jeans.Spears is currently fighting for custody of her two sons - Sean Preston, two, and Jayden James, one - with ex-husband Kevin Federline.