The mystery brunette spotted with the Harry Potter actor was Olive Uniacke – stepdaughter of Harry Potter producer David Heyman.
“Olive and Dan have known each other for a long time, ever since the Harry Potter films started,” a source revealed to the Daily Mail.
“Olive and Dan were close a few years ago, but the relationship fizzled out then,”
“Even so, they have always remained friends. And in the last few months they have grown closer again.”