Watson, 22, enrolled in the dance class after it was recommended by her co-star to stay in shape, reported Sun online.
"Like on all film sets, there is often so much time spent doing nothing. One of the other actresses on the set has been pole-dancing as a sport for a while and Emma decided to give it a go as well. She is amazed with the results because it has toned up her body so well," said a source.
This is not a first-time experience for Watson, as she has earlier partied at a pole-dancing club with friends after the New York premiere of "Harry Potter and the Deathly Hallows: Part 2".