It had been reported that American popstar girlfriend Nicole Scherzinger recently accepted a marriage proposal from the 29-year-old sportsman.
Hamilton is said to have initially rejected the reports while in Melbourne for the Australian Grand Prix on Sunday.
Now, Hamilton has taken to Twitter to write: "Hey all, need to talk about these rumours. I thought I should let you guys know that I haven't proposed to Nicole."
Hamilton rekindled his romance with the former Pussycat Doll after they split last year.