Snapshot: Christina Aguilera performs live at 'Cisco Rocks'...

San Francisco should consider themselves lucky. If ever Christina Aguilera announces a full blown tour, grab the opportunity with both hands. Over the years Aggy has made her millions performing for billionaires and private functions like these.

Just as well really. Her last few albums have struggled commercially, and it seems she's in no rush to put out another despite being in the studio recently. Sadly, announcing a tour to support her albums has as much likelihood as Beyoncé and Keri Hilson doing a duet together. Watch some video footage here.