The 33-year-old Pusscat Dolls star and the 26-year-old Formula One racing driver have been together for four years, but they did end their relationship briefly in January this year citing work commitments.
Now sources have claimed to the Sun that the pair have parted ways for good.
Scherzinger is busy judging US X Factor and Lewis Hamilton has been touring with his F1 team McLaren. Scherzinger - who this year released a solo album and filmed a part in Men In Black III - lives in Hollywood while Hamilton is based in Geneva in Switzerland.
The couple met at the MTV Awards in Munich in 2007.