In recent weeks Harry Potter star Daniel Radcliffe has been pictured holding hands with a mystery brunette. It has now been confirmed that the girl in question is 22-year-old Rosanne Coker.

The couple first met when she worked as a production assistant on Harry Potter And The Half Blood Prince in 2007, however it is reported that the pair have secretly been dating for a year now.

In total the pair have worked on four films together, including the last three Harry Potter projects and The Woman in Black – the new Hammer movie which is due for release next year.

It is suggested that Miss Coker splits her time between her family’s £400,000 home in Surrey and Radcliffe’s luxury apartment in New York.

Speaking to the Daily Mail newspaper, Rosanne’s father Malcolm said he is delighted over their relationship as Daniel is a “lovely” guy.

He added: "I don't want to say too much really as they would really prefer to keep things quiet."

Rosanne's father continued to say: 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."

Malcolm further sparked rumours that Radcliffe may be his son-in-law one day stating: "No other parent would ask any more. I know it's not a normal life they live. But they have a lot of fun together and at their age, what more could you ask? Who knows where it is going to lead?"

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