One of the Boys is the second studio album by American singer Katy Perry. It was released on June 17, 2008, by Capitol Records. She collaborated on the album with producers Greg Wells, Dr. Luke, Dave Stewart, Max Martin, and Ted Bruner among others, and wrote most of the songs in collaboration with other producers and writers. However, the title track, "Thinking of You", and "Mannequin" were all written by Perry alone. The EP Ur So Gay, containing the song of the same name, was released in 2007 to generate interest in the singer and the album.

Katheryn Elizabeth Hudson, known professionally as Katy Perry, is an American singer, songwriter, and television personality. She is known for her influence on modern pop music and her camp style, being dubbed the "Queen of Camp" by Vogue and Rolling Stone. At 16, Perry released a gospel record titled Katy Hudson (2001) under Red Hill Records, which was commercially unsuccessful. She moved to Los Angeles at 17 to venture into secular music, and later adopted the stage name "Katy Perry" from her mother's maiden name. She recorded an album while signed to Columbia Records, but was dropped before signing to Capitol Records.