But Kidman said she doesn't use it any more because she didn't like the results.
The 43-year-old is said to have confessed to having it done to a German magazine interviewer who asked about how she controlled her wrinkles.
The Rabbit Hole star said: 'I've tried a lot of things but apart from working out and a good diet most things don't help.
'I have even tried Botox but I didn't like how my face looked afterwards. Now I don't use it anymore – and I can move my forehead again.'
Nicole had previously declared that she was 'completely natural'.