The Harry Potter wizard was shown beaming in a photo appearing in the pages of Britain's Daily Mail, which described the actor and the brunette as inseparable.
The young woman reportedly was among Radcliffe's posse as he celebrated his 21st birthday in St. Petersburg, Russia, late last month. And she was there again as the two took in a recent game of cricket at The Oval in London, prompting speculation that he's been working his magic on her.
There has been no comment from his rep.
Radcliffe, once quoted as saying he wouldn't date an actress – only to be linked later to Laura O'Toole, whom he met while they were on stage in Equus – has also owned up to dating older women.