The sportsman rekindled his relationship with the former Pussycat Dolls singer earlier this year following numerous break-ups.
The pair, who have previously denied rumours of an engagement, celebrated six years together with a trip to Venice, before heading to the Hamptons.
Hamilton, who posted the images on Twitter after returning home to Monaco last week, tweeted: "Better late than never. @nicolescherzy & I in Venice for our 6th Anniversary. #goodtimes #godisthegreatest.
He added: "Then The Hamptons New York. Always wanted to go after watching "White Chicks"! We had an amazing time. @nicolescherzy."