Britney Spears has a new song to promote — have you seen the awesome video for "Pretty Girls" yet? — and that means she's giving fun radio interviews. Fortunately, one DJ with 104.1 2Day FM in Sydney, Australia, brought up Mariah Carey during their chat. Britney was clearly in the mood to get candid, as she dished about the unexpected place she listens to Mariah's music while topless. You just have to hear Britney explain it all — check out the funny interview, above, then relive your favourite Britney moments of all time.