Britney Spears was all smiles as she went shopping in Sherman Oaks, California yesterday. Her peach tank top, khaki shorts and short brown boots looked super cute as she browsed. But when she revealed the back of her head as she turned to leave, onlookers were shocked by what they saw.

The pop star had a large, grapefruit-sized spot on the back of her head covered with dark, matted, short hair; quite a contrast to the long blond locks covering the rest of her head. And unfortunately for her, photographers got a picture of the unruly mess.

Spears is still in the process of growing out her locks after shaving her head three and a half years ago. She's been getting extensions since and the harsh process isn't known for being kind to hair.