"Teenage Dream" is a song by American singer Katy Perry. It was released as the second single from her third studio album of the same name on July 23, 2010. This song was written by Perry, Bonnie McKee, Dr. Luke, Max Martin, and Benny Blanco. McKee describes "Teenage Dream" as a throwback song to the euphoric feelings of being in love as a teenager while Perry described the song as reminiscent of her youth. Musically, "Teenage Dream" is a mid-tempo pop song with a retro sound. It is styled in the genres of power pop and electropop, while taking influence from other genres such as disco and pop rock. Perry starts the song in a high-pitched voice while her vocals grow stronger as the song progresses. Lyrically, "Teenage Dream" discusses being with a lover who makes one feel young again.

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.