Katy Perry Confirms Next 'PRISM' Single

Katy Perry performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 20, 2013 in Las Vegas, Nevada. 

Photo by Ethan Miller/Getty Images for Clear Channel

The follow-up to the No. 1 single "Roar" is...

Katy Perry's latest Billboard cover story is out today, and in the pop star's breakdown of all things "PRISM," she confirmed that the power ballad "Unconditionally" will serve as the forthcoming album's second single.

Katy Perry Opens Up in The New Billboard - Read It | Own It

Hear Her Roar SubscribeBuy a CopyBillboard on iPad

When Perry previewed "PRISM" at an industry listening event earlier this month, the singer described "Unconditionally" as her favorite song on her third record, which is due out on Oct. 22. With woodblock percussion and throbbing bass, "Unconditionally" sounded like a grown-up, more grounded version of "Teenage Dream's" starry-eyed second single and title track. "There is no fear now… I will love you unconditionally," Perry sings on the track.

Perry all but confirmed that "Unconditionally" would be the follow-up to "Roar" at the iHeartRadio Music Festival last Friday (Sept. 20). "It's a love song and it's different from 'Roar' — it's not eighth-notey," Perry told MTV about the follow-up single. "And I think it's a universal love song that everyone's going to be able to relate to no matter the age, no matter male or female. It's my favorite song off the record."

"Roar," which became Perry's eighth No. 1 single on the Hot 100 chart, holds tight at No. 2 on this week's chart, while album track and non-single "Dark Horse" (featuring Juicy J) debuted at No. 17 on the tally. Perry debuted the latter song live, alongside Juicy J, during her iHeartRadio set.