Helena Bonham Carter loved imitating Hermione Granger in 'Harry Potter and the Deathly Hallows'.

The 43-year-old actress, who plays deatheater Bellatrix Lestrange in the movie franchise, says imitating the young witch - who is played by Emma Watson - was one of her favourite scenes in all of the movies.

She told MTV News: "I get to torture Hermione. The best bit about being Bellatrix in this one is because I got to pretend to be Hermione. Because Hermione takes polyjuice potion and gets to look like Bellatrix.

"Rather than put Emma Watson in a hell of a load of make-up, they just said, 'Now you go act like Hermione'. That was fun.

"I was looking at Daniel Radcliffe and Rupert Grint and they were treating me as if I was 17."

'Harry Potter and the Deathly Hallows', which is the last in the J.K. Rowling franchise, will be split into two parts, released this year and in 2011.