Formula 1 world champion Lewis Hamilton has admitted that he is "feeling pressure" to propose to his girlfriend Nicole Scherzinger.

The 29-year-old has been in a relationship with the former Pussycat Dolls singer for more than six years, and he has admitted that family members are encouraging marriage.

"I'm certainly feeling pressure, heat from family members," the Daily Star quotes Hamilton as saying.

"Nicole's massively focused on her work, the same as I am. We're happy just the way we are. At one point [marriage] will be for us."

The couple have split numerous times during their on-and-off romance.