Daniel Radcliffe refers to his girlfriend as "the nice half of my brain".

The 'Woman in Black' actor has been in a relationship with production assistant Rosie Coker for over two years and the 23-year-old star says she is always supportive and helps give him confidence.

He said: "She's like the nice half of my brain - the part of my brain that doesn't dislike me - that's her. She encourages me which is nice."

Daniel also admitted it is easier to date someone who also works in the film industry because they understand the fast paced life he leads and how he needs to capitalise on his 'Harry Potter' fame in case he sinks into oblivion.

Daniel - who hasn't taken longer than a one-week holiday in more than four years - explained in an interview with The Sun newspaper: "She knows me so she knows this is what I'm like. She knows I love my job and there's nothing I would ever do to not be doing my job.

"I love it - and also, it's not going to be like this for ever. I'm not going to be as in demand as I am now for ever. I think that in this next period of about three years I need to be really busy."