Vega was born in Miami, Florida. Her father is Colombian and her mother, Gina Rue, is an American former model. Vega has six siblings: paternal half-sister Margaux Vega (b. 1981), sister Krizia Vega (b. 1990), sister Makenzie Vega (b. 1994; starred in Saw and Sin City), maternal half-sister Greylin James (b. 2000), maternal half-brother Jet James (b. 2005), and maternal half-brother Cruz Hudson Rue (b. 2009). She moved with her family to California when she was four years old.