Rosie Coker Pictures. Harry Potter star Daniel Radcliffe is reportedly ready to ask his secret girlfriend to marry him.

The Woman In Black star, who has been dating production assistant Rosanne Coker in secret for the past year after meeting on the set of 'Harry Potter and the Half Blood Prince' in 2007, is allegedly trying to conjure up the courage to propose to her.

Rosanne, 22, and Daniel are said to have a lot of fun together and have already met each others prospective in-laws.

A source told the Sun : 'They're crazy about each other. Dan wants to marry her.'

Rosanne's father Malcolm - who runs his own painting business - said he was thrilled with the romance because Daniel is a 'lovely' guy.

He told the Daily Mail: 'I don't want to say too much really as they would really prefer to keep things quiet.

'But Rosanne has worked on the last three 'Harry Potter' films, so she and Daniel have known each other quite a long time.

'But they have been going out for just over a year now. I have met Daniel and he is a lovely guy.

'I'm just really happy for Rosanne and as long as she is happy that is all that matters to me.'

According to the Sun, film chiefs worried about 22-year-old Daniel's image as a clean-cut school boy wizard and forced him to keep his relationship quiet until the final Harry Potter film was done.

Daniel has previously dated Irish actress Laura O'Toole and was recently linked to Olive Uniacke.