America loves Britney... as does the rest of the world!
Britney Spears treated fans to a free concert at the Bill Graham Civic Auditorium on Sunday (March 27) in San Francisco, Calif.
The 29-year-old pop princess taped a performance for Good Morning America, which will air this Tuesday.
She sang hit songs like '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!
On Friday, Britney hit the stage at the Palms Casino & Resort in Las Vegas for two mini concerts.