Katy Perry, Katheryn Elizabeth Hudson

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.