Students in the US were asked to list their SAT results and write down their favourite artists, with the results showing that the 'Halo' singer's fans had the second lowest overall score.
Rapper Lil' Wayne officially has the dumbest fans, MusicThatMakesYouDumb claim.
"I've listened to artists and afterwards thought to myself, 'Wow...loving this rubbish says a lot about someone and how much they've got going on in their head'," founder Virgil Griffin said.
Fans of classical music were said to be the most intelligent, while people who listed Radiohead, Counting Crows and U2 as their favourites had above average exam scores.
A recent study suggested that Beyoncé's song 'Single Ladies' could be responsible for the global financial downturn.