Not even PEOPLE cover girl Britney Spears is immune to pranksters. As Reuters reports, the 20-year-old pop princess was duped by a pair of Montreal radio comics, Marc Audette and Sebastien Trudel -- with Audette posing as Canadian diva Celine Dion. Speaking to Spears in an on-air phone interview, Audette reportedly persuaded her to sing a duet with golfer Tiger Woods (the title of the non-song: "Let's Make a Hole in One") for some fake charity event to be held at Dion's purported club. In reality, the venue is a well-known Montreal strip joint. "We certainly won't be distracted there. Of course, Boy George won't be invited, just to be sure," Audette reportedly told Spears, in Dion's voice. Replied Spears, good-naturedly: "Oh, I would so be interested, oh my goodness, definitely. When do you all want to do it?" Through it all, Audette considered Spears a good sport, telling Reuters afterwards: "She first had a little bit of an aggressive reaction, but then she was laughing . . . She didn't even think it was a gag. I don't know why. I think she was so impressed to speak to Celine Dion."

For more details about Britney's big break, check out PEOPLE's cover story.