Jackie O asked for her boobs to be digitally reduced on billboards.

Kyle Sandilands has played a prank on his co-host Jackie O – and yes, it involves her boobs.

The pair had been photographed for a new ad campaign, with Jackie O posing in a striking, black Carla Zampatti jumpsuit with a very plunging neckline.

However, the 40-year-old mum of one was a little bit embarrassed about the amount of cleavage on show, so she asked for her bust to be digitally reduced.

On the left is the altered image, on the right is the original:

Image via Instagram @kyleandjackieo.

But then, Sandilands stepped in. He demanded that for one hour, Sydney billboards show the original, unaltered photo.

KIIS FM's Instagram account uploaded a photo of a billboard showing the original photo with the caption: "For one hour, the ORIGINAL photo on all digital billboards... Looking good @jackieo_official".

The Daily Mail reported that in a clip played on air this morning, Jackie addressed the drama.

"I've got a bit of cleavage which I asked them to cover up a bit more. There was a lot more showing," she said. "It looks like I've got a bum on my chest."

WATCH Oprah's interview with Kyle and Jackie O. Post continues after video...

Video via KIIS 1065

We think Jackie looks amazing in both photos - and we hope she's not too embarrassed by all the attention she's getting today.

TAP on the image below and scroll through the gallery for pictures of Jackie O...