AceShowbiz -

Who is the mystery brunette Daniel Radcliffe holds hand with while taking a stroll in New York City recently? The girl in question happened to be a painter by the name of Rosanne Coker, who has been working together with the actor in the last three "Harry Potter" movies and his upcoming horror project, "The Woman in Black".

Daily Mail reported that Rosanne first met Daniel when she worked as a production assistant on "Harry Potter and the Half-Blood Prince" back in 2007. The two, however, didn't start dating until last year. Speaking of the 22-year-old's relationship with the actor, her father said, "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," he added. "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."

"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? She still lives over here in London and he is in New York a lot, but she wants to make sure that she continues her career and wants to achieve everything she set out to do."

Daniel was photographed walking hand-in-hand with Rosanne in New York City last Tuesday, August 16. They were both sporting a casual look with him wearing a blue shirt, brown short and a cap, and her donning a loose purple tank top and leggings.

Daniel himself has admitted during a July interview with Larry King on CNN that he indeed has a girlfriend. "I've got a girlfriend at the moment, who I am very much in love with," the British actor confessed at the time. "So, you know, we'll see where that goes."