Dilahirkan pada 28 Jun 1995 di Sedgefield, Western Cape, Afrika Selatan dan anak kepada Bennie Peters dan Anne-Mari Steenkamp. Demi juga baru sahaja menerima ijazah sarjana muda dalam pengurusan perniagaan daripada North West University, Afrika Selatan.
Today was about taking a moment to stop, look back and appreciate the hard work and dedication that I put into educating myself #graduationpic.twitter.com/Bbr6demioa
— Demi-LeighNel-Peters (@DemiLeighNP) 2017년 3월 13일
