Harry Potter star gets close to producer's stepdaughter

The mystery brunette who accompanied Daniel Radcliffe on his 21st birthday trip to Russia has been named.

Olive Uniacke is the stepdaughter of Harry Potter producer David Heyman, who is married to the 19-year-old’s mum Rose.

Olive and Dan have known each other for a long time, ever since the Harry Potter films started,’ a source reveals.

The pair started spending a lot of time together when Olive worked as a PA on the set of new film Harry Potter And The Deathly Hallows.

Olive and Dan were close a few years ago, but the relationship fizzled out then,’ a source tells the Daily Mail.

‘Even so, they have always remained friends. And in the last few months they have grown closer again.’

Harry Potter And The Deathly Hallows is due to be released in November 2010. 

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Natalie McMurdie