That magazine's editor at the time, Sido Kitchin, has now moved to rival publication Woman's Day, which is believed to hold the publication rights for the wedding.
Hosking and Hawkesby said after their engagement that their wedding would focus on their five children - Hosking's twins Ruby and Bella and Hawkesby's children Jackson, Josh and Marley.
"There were high-fives all over the place [when they were told] and immediate questions about flower girl possibilities," Hawkesby told the Woman's Weekly.
"It's more about a big party and new outfits as far as they're concerned."
The announcement was a rare public moment for the pair. Hosking has been a staunch critic of media coverage of celebrities, and his legal fight to prevent photographs of his children being published led to the establishment of a privacy tort in New Zealand.
Of the engagement, Hosking said: "It was important to me that for once, I did this out in the open. Anyone can propose in private. But I wanted to make this gesture for Katie.
"The important thing is we don't see us as being a big deal to other people. To me, it's my life and I can barely breathe with excitement - but I've been through enough now with people ringing me up and chasing me and boring me witless, to know it's better just to get it out. There it is, we're getting married, bang, let's all get on with our lives."
Hosking's show on Newstalk ZB has the largest audience for a breakfast slot in the country. Hawkesby is now a stay-at-home mum, and contributes columns to Woman's Day. Her usually prolific Twitter contributions dried up a week ago.