Katy Perry performs at the DirecTV SXSW Live Broadcast on March 14, 2008 at the Austin Convention Center in Austin, Texas. (Photo by Sasha Haagensen/GettyImages for DirecTV)

Singer Katy Perry attends the 2009 GRAMMY Salute To Industry Icons honoring Clive Davis at the Beverly Hilton Hotel on February 7, 2009 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)

Singer Katy Perry speaks during the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Katy Perry attends the Sonia Rykiel Pret a Porter show as part of the Paris Womenswear Fashion Week Spring/Summer 2010 at Boutique Rykiel on October 4, 2009 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

Katy Perry will be hosting the MTV Europe Music Awards for the second year running. (Photo by Dave Hogan/Getty Images)

Host Katy Perry speaks on stage during the 2009 MTV Europe Music Awards held at the O2 Arena on November 5, 2009 in Berlin, Germany. (Photo by Dave M. Benett/Getty Images)

Singer Katy Perry attends the Costume Institute Gala Benefit to celebrate the opening of the “American Woman: Fashioning a National Identity” exhibition at The Metropolitan Museum of Art on May 3, 2010 in New York City. (Photo by Larry Busacca/Getty Images)

Katy Perry poses in the press room at the 2010 MTV Movie Awards held at the Gibson Amphitheatre at Universal Studios on June 6, 2010 in Universal City, California. (Photo by Jason Merritt/Getty Images)

Singer Katy Perry covers the August 2010 issue of Esquire UK in a photo shoot by Yu Tsai. (Photo by Yu Tsai/Esquire)

Singer Katy Perry arrives at the 2010 MTV Movie Awards at Gibson Amphitheatre on June 6, 2010 in Universal City, California. (Photo by Jason Merritt/Getty Images)

Singer Katy Perry performs at the world premiere of Volkswagen's new Jetta compact sedan at Times Square on June 15, 2010 in New York City. (Photo by Jemal Countess/Getty Images)

Singer Katy Perry visits “Late Show With David Letterman” at the Ed Sullivan Theater on August 24, 2010 in New York City. (Photo by Jemal Countess/Getty Images)

Singer Katy Perry performs at Splash Bar on August 27, 2010 in New York City. (Photo by Henry S. Dziekan III/Getty Images)

Katy Perry lookalike Delia Marie Williams and Lady Gaga lookalike Victoria Cluskey pose before the MTV Giant Tomato Fight in Golden Square on November 2, 2010 in London, England. (Photo by Ian Gavan/Getty Images)

Katy Perry and host Eva Longoria Parker perform onstage during the MTV Europe Music Awards 2010 live show at La Caja Magica on November 7, 2010 in Madrid, Spain. (Photo by Ian Gavan/Getty Images)

Singer Katy Perry performs during the 2010 Victoria's Secret Fashion Show at the Lexington Avenue Armory on November 10, 2010 in New York City. (Photo by Theo Wargo/Getty Images)

Katy Perry performs at BBC Radio 1's Teen Awards 2010 held at Hammersmith Apollo, on November 14, 2010 in London, England. (Photo by Dave Hogan/Getty Images)