Nicole and Lewis celebrate six years together in Venice, Italy Credit: Courtesy Lewis Hamilton

That's amore! It's been rollercoaster relationship but Nicole Scherzinger and Lewis Hamilton have celebrated the survival of their romance with a sixth anniversary trip to Venice, Italy.

Race car driver Hamilton shared pictures of their romantic trip with a photo montage via Instagram on Monday, June 23.

Apologizing for his late upload, the British Formula One racer wrote, "Better late than never. @nicolescherzy & I in Venice for our 6th Anniversary. #goodtimes #godisthegreatest."

Scherzinger, 35, and Hamilton, 29, have dated on and off since 2008. They broke up and reconciled in 2010, and then split again last summer. Unable to stay apart, the pair reunited once again at Christmas.

"It's very much at a point of working things out still," a source told Us Weekly of the duo in March. But things are evidently still going strong, and Hamilton is keen for the world to know about it.

In addition to his Venice holiday snaps, the sportsman and his former Pussycat Dolls girlfriend also shared a few intimate pictures of their subsequent vacation in the Hamptons, where the duo spent time riding bikes and enjoying the sunshine together

"Then The Hamptons New York," wrote Hamilton. "Always wanted to go after watching 'White Chicks'! We had an amazing time."