(Cover) - EN Star Style - Mila Kunis walks like a penguin after following intensive ballet training for Black Swan.

The 27-year-old Hollywood star appears alongside Natalie Portman in Darren Aronofskys thriller about a troubled ballerina who lands her dream role in Swan Lake.

Mila has spoken in the past about the gruelling dance training she underwent for the movie, which saw her developing the figure of a professional ballerina. The star admits donning the famous pointe shoes which allow dancers to move on tip toe has left her with a bizarre swagger.

Just walking in point shoes not even on point was one of the most painful things Ive ever done, she told the British edition of OK! magazine. I walk like a penguin now!

Mila found shaping up for Black Swan an extreme struggle, notably because she had never been an accomplished dancer. The star does have happy memories of wearing a traditional tutu as a little girl though.

The extent of my dance training when I was little was being a nine year old in a tutu. I was doing ballet seven days a week at an average of four hours a day and I had my first day off on my birthday. My one day off in a month, she added. (C) Cover Media