What's Sexting? Keira Knightley Is Stumped

Keira Knightley has admitted that she doesn't know the meaning of the flirting slang 'sexting'.

During an interview with Marie Claire magazine, the 26-year-old actress was quizzed about whether or not 'sexting' constitutes cheating, to which the Pirates of the Caribbean star replied that she was unaware of the meaning of the word.

'I'm sorry. What about what? What is that?' the Daily Mail quoted the baffled actress as saying.

'Oh my God. I don't have an answer for that. I didn't even know what it was,' she added.

The 26-year-old was discussing her latest film Last Night, which tells the tale of a married woman who considers having an affair with an ex-lover.

Keira mused over whether an emotional or physical betrayal was worse, saying: 'I really thought women would find emotional betrayal worse and men would consider a physical betrayal worse.'

Keira was present in Venice over the weekend to promote her latest project A Dangerous Method at the 68th annual Film Festival.

She plays a sex-starved psychiatric patient, who was the first person that the Freudian method of psychoanalysis was used.