Katy Perry performs Firework with Oscars choir

Katy Perry had her own Oscars moment hours after her husband Russell Brand made his debut at the Academy Award alongside Arthur co-star Helen Mirren when she took to the Kodak Theatre stage as part of Oprah Winfrey's big show wrap-up special on Monday (28Feb11).

The pop star took a break from her European tour and flew in to Los Angeles from Austria to join Sunday's (27Feb11) Oscars finale performers, the student choir of PS 22, for a rendition of her hit Firework.

Katy Perry stunned the kids and Oprah Winfrey's Kodak Theatre audience when she stepped out onto the stage from behind a screen, dressed in a form-fitting gold dress.

The rousing performance ended with images of fireworks lighting up the hi-tech stage as the kids rushed to hug and high-five Katy Perry.