Aldridge was born at Saint John's Hospital in Santa Monica, California and hails from a fashion-oriented family. She is the daughter of English artist Alan Aldridge and Playboy Playmate of the month Laura Lyons. Her siblings include half-sister Saffron Aldridge, who was a multiyear face of Ralph Lauren in the 1990s; half-brother Miles Aldridge, who is a fashion photographer married to 1990s model Kristen McMenamy; and sister Ruby Aldridge, who was the face of Marc by Marc Jacobs.