Video! Britney Spears a Hit in San Francisco 'GMA' Taping

After her "surprise" stop in Las Vegas Saturday, Britney Spears took to the concert stage again in San Francisco early Sunday morning as part of a taping of "Good Morning America."

The singer performed three songs; "Hold It Against Me," "Till the World Ends" and "Big Fat Bass." Watch a sneak peek!

Check out all the photos from the performance!

All the footage will air March 29 on "Good Morning America."

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