Actress Keira Knightley says she is addicted to painting her nails in crazy colours for fun.

In an interview with Britain's HELLO! magazine, the 29-year-old talked about her addiction, reports femalefirst.co.uk.

"During filming, I am carefully made-up for weeks, so at the end of every film I love to go out and buy nail polish in the most absurd colours and paint my nails with them," she said.

"Last time I chose yellow - which I don't recommend. I looked like I and nicotine-s