updated 06/23/2010 AT 10:00 AM ET
•originally published 06/23/2010 AT 12:30 PM ET
Not everyone has Bieber Fever!
In fact, there are some – even showbiz types – who are unaware of the teen pop phenom.
And when he did, the Harry Potter star was in for a surprise.
“I genuinely thought it was a woman singing. I’d never heard it before,” the Brit, 20, says, laughing.
One star, however, who has caught Radcliffe’s attention: Lady Gaga. “I think she’s kind of amazing. She’s really got a voice. My god, you know?” he says, before admitting that her style isn’t quite “my kind of music particularly.”
Still, says Radcliffe, “she can really sing.”