Katy Perry ''convulsed'' when she found out Russell Brand had filed for divorce.

The 'Teenage Dream' singer discovered her 14-month marriage was coming to an end last December, just as she was about to go on the stage to perform on her tour, and while she admits she had to ''separate'' herself from the problem because she was a ''professional'', she still struggled to deal with the turmoil in her personal life.

She said: ''I was convulsing a little bit ... I still have to find the balance, I had to separate my personal from my professional. As an entertainer, I knew what my job was and I shouldn't like take it out on my audience, they've always been there for me.''

Footage of the split news is shown in her new movie 'Katy Perry: Part of Me', and she admits looking back at her life for the film has been a strange experience as she realised she has achieved everything she wanted out of life at the age of 27.

Speaking on the 'Kylie and Jackie O Show' on Australian radio station 2Day FM, she said: ''You see so much footage of me as a young kid, as 18, speaking to the camera telling the camera, this is what I want to do, this is where I want to go, this is what I want to achieve in life, it's very surreal to be looking back at that and going ... 'Oh, well I've done it.' ''