The two singers are also joined by Bonnie McKee, Kacey Musgraves, Tegan and Sara and Ellie Goulding to perform the lead single off upcoming 'Prism' album.
Katy Perry made a brilliant appearance when headlining her charity concert, "We Can Survive: Music For Life". The event, which was held at the Hollywood Bowl in Los Angeles on Wednesday night, October 23, benefits organization Young Survival Coalition which supports young women battling breast cancer.
Perry wasn't the only performer at the sold-out concert as she had enlisted several fellow singers to join her. Bonnie McKee, Kacey Musgraves, Tegan and Sara, Sara Bareilles and Ellie Goulding were all present to lend their star power.
Perry opened her own set with "I Kissed a Girl". She later belted out other hits, including "Walking on Air", "Teenage Dream" and "California Gurl".
For the last song, Perry treated her fans with an energetic performance of her chart-topping hit, "Roar". She brought out all of her famous guests to sing to the tune together.
The show was also meant to celebrate the release of "Prism", Perry's newest studio effort that is now available in Australia and New Zealand. Fans in the U.S. have to wait until next week as the record will arrive in the country on October 28.