Being the covergirl for Billboard's annual Women in Music edition is nothing to be sniffed at, and this year's chosen one - Katy Perry - more than lived up to the hype.

It's gratifying to see the global superstar finishing the year on a high after undergoing harrowing personal problems over the past 12 months that saw her marriage to comedian Russell Brand, 27, end in divorce.

Katy, who turned 28 on October 25, told Billboard: 'I'm glad I'm still alive-27 has been a very testing year.'