The 22-year-old told a US reporter that she and Daniel Craig had been shooting in a honeymoon suite in Quantum Of Solace.
The surprised journalist asked, "Honeymoon suite?", prompting Arterton to reply: "I think I've said too much."
The actress, who can currently be seen in St Trinian's, plays an MI6 agent working at the British consulate in Bolivia.
George Lazenby's Bond married Tracy Draco (Diana Rigg) in the 1969 movie On Her Majesty's Service. However, she was murdered in a drive-by shooting on their wedding day.