Katy Perry hit London this week for a performance at the star-studded iTunes Festival. With just weeks until the release of her next album, "Prism," Perry used the show to debut a new track off of the record.


Perry, who also played hits such as "Teenage Dream" and "Firework," premiered "By the Grace of God." The emotional song took Perry to a vulnerable place as she sang about hitting bottom after her divorce from former husband Russell Brand.


She recently opened up to Billboard about "By the Grace of God," telling the publication, "That song is evident of how tough it really was at a certain point. I asked myself, 'Do I want to endure? Should I continue living?'" Take a listen to the new song above.


The 28-year-old singer also recently released the full tracklist to her "Prism" album, which is set to hit stores on Oct. 22. Check out the songs included on the standard and deluxe editions below.


1. Roar

2. Legendary Lovers

3. Birthday

4. Walking On Air

5. Unconditionally

6. Dark Horse

7. This Is How We Do

8. International Smile

9. Ghost

10. Love Me

11. This Moment

12. Double Rainbow

13. By the Grace of God

Deluxe edition bonus tracks:

14. Spiritual

15. It Takes Two

16. Choose Your Battles



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  • 2002: Portrait Session




  • 2004: American Music Awards




  • 2005: Esquire Magazine Event




  • 2006: Vanity Fair Event




  • 2007: Fashion Rocks




  • 2008: Chanel Boutique Opening




  • 2008: MTV TRL




  • 2008: Travis McCoy's Birthday Party




  • 2008: Rok Las Vegas Performance




  • 2008: VMA After-Party




  • 2008: MTV VMAs




  • 2008: Berlin Concert




  • 2008: Patrick DeMarchelier Exhibit




  • 2008: Fashion Cares Event




  • 2008: MTV Europe Music Awards




  • 2009: Grammy Awards




  • 2009: Paper Magazine's Beautiful People Party




  • 2009: "The Model As Muse" Met Gala




  • 2009: House of Molinari Birthday Celebration




  • 2009: MTV Video Music Awards




  • 2009: MTV Europe Music Awards Press Conference




  • 2009: MTV Europe Music Awards




  • 2010: Vanity Fair Oscar Party




  • 2010: Met Gala




  • 2010: MTV VMAs




  • 2010: Nickelodeon Kids' Choice Awards




  • 2010: MTV Movie Awards




  • 2011: Grammy Awards




  • 2011: 'Smurfs' Premiere




  • 2011: MTV VMAs




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