She used to take calls from him constantly during photo shoots.
And he spoke of their frequent incognito holidays and how well she fitted in when they visited his family in Hertfordshire.
But after four years, one of the most exciting couples on the Formula One circuit have reached the end of the road. Race ace Lewis Hamilton and American singer Nicole Scherzinger have parted company.
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The couple are said to have split because their hectic work schedules meant they saw very little of each other.
"They are still very good friends and it was an amicable split," a friend said.
"But they just decided it was impossible to keep the relationship going with such conflicting work schedules."
A representative for the pair confirmed the news.
Nicole, 33, currently stars as a judge on the X Factor USA and is based in Los Angeles.
Lewis, 26, meanwhile, travels all over the world on the F1 circuit and resides in Switzerland.
The couple started a passionate romance after meeting at the European Music Awards in Munich in 2007.
Pictures of stunning Nicole screaming herself hoarse in encouragement of her beau became common.
And the Hawaiian beauty celebrated with him in 2008 when he zoomed into the history books as the youngest champion in the sport's history.
Endless airport-hopping seemed to take its toll, though. The photogenic duo split in January 2010, only to reunite a short while later.
And there were even engagement rumours. But now, Nicole and Lewis have called it a day once again, depriving fans of their high-octane appearances on red carpets and yachts around the world.