Britney Spears treats fans to a free concert

Britney Spears treats fans to a free concert at the Bill Graham Civic Auditorium in San Francisco, Calif.

Britney Spears treats fans to a free concert at the Bill Graham Civic Auditorium in San Francisco, Calif.

The 29-year-old pop princess taped a performance for Good Morning America, which will air this Tuesday.



After singing Hold It Against Me, Big Fat Bass, and Till the World Ends, Brit was given a framed proclamation stating March 29 will be Britney Spears Day in San Francisco.

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