Emily Blunt believes Natalie Portman is ''spooky good'' in 'Black Swan', and admits she can't compete with her ballet prowess.
The 27-year-old British actress plays a ballerina in new movie 'The Adjustment Bureau' and admits that even after months of training, she didn't master The Craft as well as Oscar-nominated Natalie did in the recent dance-based thriller.
She said: "I literally had never done it before in my life. I had to do four months of boot camp, swept out of my comfort zone. I've got calves of steel.
"I had a full-blown anxiety attack watching 'Black Swan'. It was extraordinary what Natalie did - spooky good."
As well as taking dance lessons, Emily also taught herself how to run in a different way following advice from co-star Matt Damon.
She admitted: "Matt's given me good advice - 'make sure you watch yourself on playback. You might run like an idiot and not know it.'
"I had this chicken-arm flapping about. Thank God I caught that."