AMERICAN IDOL star Carrie Underwood has broken a country music record by becoming the fastest-selling debut artist ever.

Album SOME HEARTS has been certified double platinum in the US after making it past the two million sales market.

And chart compilers Nielsen SoundScan say that makes the album the fastest-selling debut country album in history.

Underwood can thank a Christmas (05) surge in sales for her record-breaking success - fans bought up 400,000 copies in the week leading up to Christmas.