Indian-born nurse Jacintha Saldanha transferred the hoax call from the DJs pretending to be Queen Elizabeth II and William's father Prince Charles to a colleague who divulged details of Kate Middleton's severe morning sickness.
Prank call victim Jacintha laid to rest
The broadcast of the call made global headlines and Saldanha was found hanged three days later.
Tearful radio hosts apologise to nurse’s family for Kate hoax call
Australia's Communications Minister Stephen Conroy said the award was in poor taste given the circumstances.
"I think there's a bit of bad taste involved there," he told Melbourne radio station 3AW on Wednesday.
A joke gone wrong
"There were some very serious consequences of what was a prank, and to be seen to be rewarding people so soon after such an event, I think, is just in bad taste."
Australian radio DJs were trained 'not to air any prank calls': report
Nurse Jacintha blamed radio DJs in her suicide note
Christian hinted at the incident in his acceptance of the prize, which comes with a trip to Los Angeles for a studio tour.
"From the start I felt like I had something to prove to myself," he said in a statement.
"That regardless of all that's happened in the past few months I'm still at the top of my game. So it felt good to see my name at the top of the final leader board."