Daniel Radcliffe reportedly wants to marry his girlfriend, Rosanne Coker. The Harry Potter star's secret love was only revealed yesterday - although they have been dating for a year - and Daniel, 22, is already said to have his sights set on marriage.

"They're crazy about each other. Dan wants to marry her," a friend revealed.

While Daniel met Rosanne on the set of Harry Potter and the Half-Blood Prince, where she was working as a runner, in 2007 she is said to have made him wait until the end of shooting the final film in the series, Harry Potter and the Deathly Hallows Part 2, last year before she would date him.

"Dan really fell for Rosie in a big way. He was doing all the chasing and Rosie made him sweat. She was always attracted to him but wanted to keep their on-set relationship as strictly business – much to Dan's dismay. But he agreed and realized that Rosie was worth holding out for," another friend said.

Daniel has already proved a hit with 22-year-old Rosanne's parents, and her father, Malcolm – a painter and decorator – has praised him as a "lovely" guy: "I don't want to say too much really as they would really prefer to keep things quiet. 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."

Before Roseanne, Daniel had dated Irish actress Laura O'Toole and was recently linked to Olive Uniacke.