Katy Perry, Katheryn Elizabeth Hudson

On May 16, 2009, Perry performed at the opening ceremony of the annual Life Ball in Vienna, Austria. In June 2009, lawyers acting for Katy Perry opposed the recent trademark of Australian fashion designer Katie Perry who uses her own name to market loungewear. Some media outlets reported this as a lawsuit, which Katy Perry has denied on her blog. Katie Perry the designer reports on her blog that at a hearing with IP Australia on July 10, 2009, the singer's lawyers withdrew their opposition to the trademark. During the summer of 2009 Perry filmed a cameo appearance for Get Him to the Greek; her scene, in which she kisses her future fiancé Russell Brand was cut, and does not appear in the final film. Discussing the issue with MTV, Perry hypothesized there may have been some fear that seeing the two make out would have taken viewers out of the experience. In 2009, Perry was featured on two singles: a remix of Colorado-based band 3OH!3's song "Starstrukk" in August (the idea for the collaboration came after Perry's tour that featured 3OH!3 as the supporting act). The song was released over iTunes on September 8, 2009; and "If We Ever Meet Again", the fourth single off Timbaland's album Shock Value II in December. In October 2009, MTV Unplugged revealed that Perry was one of the artists to perform for them, and that she would be releasing a live album of the performance, including two new tracks, "Brick by Brick" and Fountains of Wayne cover "Hackensack". The album was released on November 17, and includes both a CD and a DVD.
• 2010–present: Teenage Dream
Perry appeared as a guest judge alongside Simon Cowell, Cheryl Cole and Louis Walsh during the Dublin audition stage of the seventh series of the British television show The X Factor on June 28, 2010 (later televised on August 28). She was one of the many celebrities chosen to fulfil the role of judge whilst Dannii Minogue was on maternity leave. She later returned to the show on October 17 to perform "Firework". Perry's second mainstream studio album was titled Teenage Dream and was released in August 2010. The first single from the album was titled "California Gurls". The single peaked at number one on the Billboard Hot 100 and was the fastest rising single from a Capitol Records artist since Bobbie Gentry's "Ode to Billie Joe" in 1967. The cover art for Teenage Dream is a painting by Will Cotton in which depicts Perry lying naked on clouds of cotton candy; resembling the shots of Perry in the video for "California Gurls". The booklet of the physical edition of the album, in keeping with the theme of cotton candy, has a cotton candy scent. The album's second single "Teenage Dream" was released in July 2010. "Firework" is the album's third single.
Katy Perry appeared at the 2010 MTV Video Music Awards on September 12, 2010. She was nominated for two awards and presented the award of "Best Male Video" with Nicki Minaj to Eminem. On September 14, she returned to her old high school, Dos Pueblos High School, where she performed a short set for the school's students. Perry performed "Hot n Cold" with Elmo from Sesame Street, which was originally to appear on the forty-first-season premiere of the educational children's program on September 27, 2010. However, four days before the scheduled airing, Sesame Workshop announced, "In light of the feedback we've received on the Katy Perry music video ... we have decided we will not air the segment on the television broadcast of Sesame Street, which is aimed at preschoolers. Katy Perry fans will still be able to view the video on YouTube." The main reason was that parents complained about what appeared to be a great amount of cleavage shown by her dress. Perry shot the video for Firework in Budapest in September 2010. An open casting call drew an unprecedented 38,000 applicants. She proceeded to perform at a concert in Budapest on October 1, her first concert in Central and Eastern Europe. Perry has announced her own fragrance to be released in autumn of this year, named "Purr". It will come in a cat-shaped bottle, and will be available through Nordstrom stores. 'Teenage Dream led Perry to nominations four awards at the 2011 Grammy Awards: Album of the Year, Best Pop Vocal Album, Best Female Pop Vocal Performance for "Teenage Dream", and Best Pop Collaboration with Vocals for "California Gurls". Following the Grammys, Katy Perry released the fourth single from her album "Teenage Dream", "E.T." The single was a remixed version featuring Kanye West. The music video for E.T. was directed by Floria Sigismondi and features Shaun Ross as the main love interest.