The Olympic moguls champion headed to Voss-Myrkdalen, Norway, in fine form – sitting atop the World Cup rankings.
And having been forced to settle for silver in 2011 in Deer Valley behind Canadian Jennifer Hall, Kearney looked hellbent on re-claiming the world title she last held back in 2005.
And the 27-year-old did exactly that, holding off the challenge of Japan's Miki Ito and Canadian Justine Dufour-Lapointe who finished second and third respectively, to claim her second world title, a feat only matched by Norway's Kari Traa when she won back to back gold medals in 2001 and 2003.
Meanwhile, Great Britain's Ellie Koyander finished 37th in the women's event.
In the men's event the World Cup leader was also victorious as Mikael Kingsbury of Canada upgraded his bronze from 2011 to gold this time around.
The 20-year-old has a commanding lead over compatriot Alex Bilodeau in the World Cup and it was a similar story in Norway as Kingsbury won gold and Bilodeau was forced to settle for silver – the same colour he ended up with in Deer Valley.
Meanwhile, American Patrick Deneen, who won the title in 2009, won bronze this time around.