British actor Ralph Fiennes is considering suing a US publication that falsely reported he'd ditched his 61-year-old lover Francesca Annis for a younger model.

The MAID IN MANHATTAN star, 42, is furious at an article in the New York Post which alleged he was seen flirting and canoodling with 43-year-old actress Gina Gershon.

It read: "They made out in a booth and then cuddled the rest of the night."

After protesting his innocence, Fiennes refused to make any further comment on the press slur, but a close friend insists, "He'll fight this all the way."

The source adds, "There is no truth in any of these suggestions. It's pure personal conjecture."