Britney Spears Wows at 'GMA' Concert
Watch Spears' concert Tuesday on "GMA" and find out her special announcement!
PHOTOS: Britney Spears Concert on 'GMA'
Britney Spears performed Sunday at the Bill Graham Civic Auditorium in San Francisco, Calif. in front of a crowd of thousands of screaming fans in a special concert to air Tuesday, March 29 on "Good Morning America." (Rick Rowell/ABC News)
