Zitney Spears

Britney Spears' mug was popped last night as she headed into a supermarket to fetch a few groceries after a hard couple of hours in the recording studio.

Wearing a tweed cap to hide her scraggly, shoe-dyed weave -- in her new disguise as a 1930s gangster/Calamine lotion spokeswreck -- the pop star picked up some corn flakes, eggs and cleaning supplies for her palatial mansion.

It's hard to be squeezin' in everything when you're a single mom, y'all.