The singer-and-actress is set to wed NFL star Eric Johnson after he proposed to her on 11.11.10, six months after they started dating.
Her representative said: "Yes, I am excited to confirm that they are engaged."
The 30-year-old star - who was previously married to Nick Lachey for three years until they split in 2005 - showed off her diamond engagement ring on 13.11.10 during a photocall in Kansas while promoting her JessicaSimpson Collection fashion line.
The `Come On Over` hitmaker began dating Eric in May, three months after the sportsman filed for divorce from stylist Keri Johnson.
News of Jessica`s engagement comes just weeks after her ex-husband Nick announced he is set to marry his current partner, Vanessa Minnillo.
Jessica previously hinted she wanted to marry Eric, 31, and have children with him.
She said recently: "I am from the south so I`ve definitely dreamed of being married my whole life and having children, so hopefully that`s in my future."
The blonde beauty also praised the footballer for making her happier than ever.
She said: "He definitely makes me very happy. He brings out a lot of light in me and makes me very comfortable being who I am. It`s nice to be with somebody who praises you for the right reasons."