Katheryn Elizabeth Hudson (born October 25, 1984), known professionally as Katy Perry, is an American singer, songwriter, and television judge. After singing in church during her childhood, she pursued a career in gospel music as a teenager.

Perry signed with Red Hill Records and released her debut studio album Katy Hudson under her birth name in 2001, which was commercially unsuccessful. She moved to Los Angeles the following year to venture into secular music after Red Hill ceased operations and she subsequently began working with producers Glen Ballard, Dr. Luke, and Max Martin.

After adopting the stage name Katy Perry and being dropped by The Island Def Jam Music Group and Columbia Records, she signed a recording contract with Capitol Records in April 2007.

John Michael "Ozzy" Osbourne (born 3 December 1948) is an English singer, songwriter, actor and television personality. He rose to prominence during the 1970s as the lead vocalist of the heavy metal band Black Sabbath, during which he adopted the nickname "The Prince of Darkness".

Osbourne was fired from the band in 1979 due to alcohol and drug problems, but he went on to have a successful solo career, releasing eleven studio albums, the first seven of which were all awarded multi-platinum certifications in the United States. Osbourne has since reunited with Black Sabbath on several occasions.