Katy Perry ends Hollywood Bowl debut with all-star sing-along

Katy Perry closed out her debut at the fabled Hollywood Bowl on Wednesday night (23Oct13) by staging a Roar sing-along with her special guests.

The pop superstar organized and headlined the girl power We Can Survive concert for breast cancer awareness and invited the likes of Ellie Goulding, Tegan & Sara and Kacey Musgraves to perform at the gig.

And, as a special thanks to fans who sold out the venue, Perry staged an all-star sing-along of her latest hit, inviting all the musicians to join her onstage and belt out Roar.