Lewis Hamilton, Nicole Scherzinger engaged

Nicole Scherzinger and Lewis Hamilton are engaged, said the pop star's father Alfonso Valiente.

The 'X Factor' judge and the Formula One driver, who have been dating on and off for the past four years, are set to marry after Lewis popped the question, Female first reported.

"You know about the proposal? Yes they are engaged. My future son-in-law is a really nice guy, really down-to-earth. He is sincere and he and my daughter seem genuinely happy together.

"Lewis is a really good guy. When they came to visit, we hired them a Jeep because he had never driven one before. My family all like him. The good spirit is there," Valiente said.

But a spokesman for 25-year-old Lewis refused to confirm their engagement.