The 44-year-old actress played the role of evil witch Bellatrix Lestrange in the movie series and she said it was great fun.
Speaking to UK newspaper Daily Mirror, she said: 'I loved doing it and being part of it. It was perfect for me as a mum and really convenient because it was filmed not too far from where we live.'
The actress lives in Belsize Park in London with her long-time partner Tim Burton and their two children, Billy and Nell.
She said: 'Once you have children you have to work around their needs. I also loved my character because it was very therapeutic for me to just go to work and scream a lot!'