Although Katy Perry is best-known for frothy ... she asked before jumping into "California Gurls," which she performed while waving the California state flag and bounding back and forth on the stage.

Katy Perry’s onstage costumes are a masterclass ... Viewers may have zeroed in on Perry waving the California state flag, but there was another meaningful detail in her look.

Katy Perry performed several of her hits, including Rise, Roar, and California Gurls, while waving the California state flag ...

Katy Perry belted out “California Gurls,” and Joni Mitchell offered a rare performance as Angelenos spoke movingly about loss — and resilience.

Although Katy Perry is best-known for frothy ... she asked before jumping into “California Gurls,” which she performed while waving the California state flag and bounding back and forth ...