It was an all-star jam at Katy Perry's We Can Survive charity show in Los Angeles last night (Oct. 23).

The singer invited her guests -- Tegan + Sara, Ellie Goulding, Sara Bareilles and Kacey Musgraves -- to join her. They all sang along on the the epic, anthemic chorus and did their thing on the verses!

How cute! Girl power was in full effect last night as the ladies and their lovely voices came together to rip through Perry's hit song, which is definitely a survival anthem.

The show benefited young victims of cancer.

We love the confetti ending, too! It was a party and a good cause.

Katy, Tegan + Sara, Ellie, Sara B. and Kacey were all champions last night. We bet that all of Los Angeles heard 'em 'ROAR' from the Hollywood Bowl. We hope they raise tons of money for the cause. A big thumbs up to Katy for making her big release week about others and not just herself. Nice job, KP!

Katy at the pre-show, looking "kute."

Timothy Norris

The fans aka Katy Cats turned out in droves.

Timothy Norris

Katy, the girls and confetti, er, konfetti!

Timothy Norris