Justin Bieber's ex-girlfriend, Cindy Kimberly, has opened up about her rumoured romance with Formula One star Lewis Hamilton.

Speaking with Europa Press, Kimberly downplayed claims of the pair's romance but said she never ruled out a friendship's possibility of love.

"For now we are friends, I do not rule out anyone in general," she told Europa Press.

"All friendships are open to love, my heart is 70 per cent occupied ... It is due to my cats and my mother."

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Instagram sensation Cindy Kimberly. Photo / Instagram
Instagram sensation Cindy Kimberly. Photo / Instagram
Lewis Hamilton during previews ahead of the F1 Grand Prix of Azerbaijan. Photo / Getty
Lewis Hamilton during previews ahead of the F1 Grand Prix of Azerbaijan. Photo / Getty

"It will be interesting, and I'm going there with a mindset that I've got to try and improve my previous years' performance.

"I was fortunate to get the win there last year but I wasn't quick enough really through the weekend.

"So that's a place I expect Valtteri to be quick and I expect the Ferraris to be particularly quick."