Katy Perry Brings Ellie Goulding, Sara Bareilles to the Hollywood Bowl (Photos)

Bonnie McKee

Bonnie McKee opened the evening with a short set, which included her recent single "American Girl."

Bonnie McKee

McKee joined bill last minute, a fitting opener as she has penned several of Katy Perry's biggest hits.

Kacey Musgraves

Kacey Musgraves represented the country genre with a set of tracks off her acclaimed album Same Trailer Different Park.

Tegan and Sara

Tegan and Sara closed their evocative set with single "Closer," a dance-tinged number off recent album Heartthrob.

Sara Bareilles

Sara Bareilles dedicated one of her songs to a friend who recently overcame breast cancer, telling the crowd "We are stronger together than we are alone."

Ellie Goulding

"Just so you know this is one of the most incredible things I've ever seen in my whole life," Ellie Goulding told the crowd during her set.

Ellie Goulding

Goulding performed a selection of her hits, including "Lights." She told the audience, "If you do have a light source please put it up for this song."

Katy Perry

"That's why we're here because we're survivors, right?" Perry told the crowd before performing new track "By The Grace Of God." "We have a choice - to be defeated or to survive."

Katy Perry

Perry's performance reflected the buoyant, simplistic pop songs on Prism, which came out on Tuesday.

Katy Perry

Perry opened her ten-song set with past hit "I Kissed A Girl."

Katy & Juicy J

Rapper Juicy J came out for a rendition of the pair's collaboration track "Dark Horse," off Perry's new album Prism.

Katy Perry

The singer performed her new single "Unconditionally," which will receive a music video in the coming weeks she says was shot in London.

Katy Perry

Perry was assisted by a collection of white-clad dancers and shimmering silver production, offering a sense of what's to come from her tour next year.

Roar

All the performers joined Perry onstage during her encore performance of single "Roar," trading verses throughout the song.

Encore

The encore revealed the disparate nature of the all-female lineup, all connected by their support of breast cancer awareness and their pop inclinations.