Erin Foster was born August 23, 1982, in Los Angeles, California, to record producer David Foster and former model Rebecca Dyer. She is the middle sister of actress Sara Foster and fashion stylist Jordan Foster. Through her father's later marriages to Linda Thompson in 1999 and Yolanda Hadid in 2011, she was stepsister to television personalities Brody and Brandon Jenner and models Gigi and Bella Hadid. In the early 2000s, Foster began her acting career, appearing in Castle, The O.C., House, American Dreams, Gilmore Girls, Judging Amy, and Roswell.