Erin Invicta Everly was born in Los Angeles on November 8, 1965 to musician Don Everly of The Everly Brothers and model/actress Venetia Stevenson. Her siblings are brother, musician and music producer, Edan Everly, and sister Stacy Everly. Actress Anna Lee was her grandmother and her grandfather was director Robert Stevenson. Actor Jeffrey Byron is her uncle.

Erin moved from Los Angeles to New York in 1982 to join Wilhelmina Models. She appeared in many print ads and commercials in the 1980s for the likes of Jordache, Bebe, and Guess. She also appears in the Guns N' Roses music video for "Sweet Child o' Mine". She had a brief 1-year marriage to musician Axl Rose.

Relocating from Los Angeles to Atlanta in the early 90s, she married Atlanta businessman, Jack Portman. She is the proud mother of 3 beautiful children, son Easan (1996), daughter Eres (2000), and daughter Esper (2009), and stepmother to actress Joannah Portman.

Erin has managed to guard herself and her children from the public eye for 20 years, immensely enjoying a private family life.