Nicole Scherzinger andLewis Hamiltonhave reportedly called time on their romance.

Despite reports suggesting that the Formula 1 star was [uuid=bd396cd1-b5a4-4fbd-9c15-0b5e1c87df5e]due to propose to Scherzy[/uuid], The Sun has claimed they have struggled to find time for their relationship, with him based in Switzerland and her in the US.

A source told the paper: "It’s so hard to keep up a relationship when they’re barely in the same country as each other.

“Both have supported each other in their careers and will continue to do so. But the nature of their work ultimately cost their relationship.”

The couple, who recently celebrated their fifth anniversary together, previously split last year - with The X Factor judge [uuid=e88f5e9a-acca-48f3-b00f-5fea19f57b4f]forced to deny reports[/uuid] linking her to R&B bad boy Chris Brown.

Neither Nicole or Lewis has commented on the rumours, but keep it MTV News UK for more on this story.