Katy Perry 2013 to 2014

Katy Perry attends the 55th annual Grammy Awards on Sunday, 10th February 2013, in Los Angeles, CA, United States.

Katy Perry with Kristen Stewart and Selena Gomez at Kids' Choice Awards on March 23 2013 in Los Angeles, California.

Katy Perry attends the the pre-Met Ball special screening of 'The Great Gatsby' after-party at The Top of The Standard on May 5, 2013 in New York City.

Katy Perry attends the Costume Institute Gala for the 'PUNK: Chaos to Couture' exhibition at the Metropolitan Museum of Art on May 6, 2013 in New York City.

Katy Perry performs live on stage for breakfast television show 'Sunrise' at the Sydney Opera House on October 29, 2013 in Sydney, Australia.

Katy Perry attends the 2013 MTV EMAs were held at the Ziggo Dome, Amsterdam, Netherlands, on 10 November 2013.

Katy Perry and Selena Gomez attend Hollywood Stands Up To Cancer Event with contributors American Cancer Society and Bristol Myers Squibb hosted by Jim Toth and Reese Witherspoon and the Entertainment Industry Foundation on Tuesday, January 28, 2014 in Culver City, California.

Katy Perry, winner of Woman of the Year, pose in the winners room at the Elle Style Awards 2014 at One Embankment on February 18, 2014 in London, England.

Katy Perry attends The Museum of Contemporary Art, Los Angeles, Celebrates 35th Anniversary Gala Presented By Louis Vuitton at The Geffen Contemporary at MOCA on March 29, 2014 in Los Angeles, California.

Katy Perry arrives music awards, Rapper Juicy J and singer Katy Perry accept Best Female Video for 'Dark Horse' onstage during the 2014 MTV Video Music Awards at The Forum on August 24, 2014 in Inglewood, California.