Katy Perry was born as Katheryn Elizabeth Hudson in Santa Barbara, California, the middle child of pastor parents, Mary Christine (Perry) and Maurice Keith Hudson. She has an older sister and younger brother, and has English, Portuguese, German, Irish, and Scottish ancestry. Her mother's half-brother was director Frank Perry.

Raised in a deeply religious family, Perry's first experience of performing was singing in church. A passion for music grew and at the age of 15, Perry began visiting Nashville, gaining experience of song writing and recording demos.

She signed to a Christian record label, Red Hill, and recorded an album, under her birth name of Katy Hudson. The album was not a success. At age 17 she moved to Los Angeles and collaborated with producer Glen Ballard, but was not able to secure a lasting record deal. Perry did sign to Columbia Records in 2004, but again this did not prove a success, and she was dropped.