Dannii is a judge on the show alongside Irish crooner Brian McFadden and Aussie shock jock, Kyle Sandilands.
In the latest pre-recorded episode of Australia's Got Talent, broadcast Down Under on Wednesday (May 18), Dannii was thrilled when Dylan Yeadle, an apprentice plumber from Launceston, Tasmania walked on stage.
As he sang Tom Jones' Sex Bomb, he stripped off to his red undies, revealing an impressive six-pack and set of muscles.
At one stage, Dannii even held her notes up to her eyes as she pretended to be shocked.
Speaking once he had finished his act, mother-of-one Dannii, 39, claimed: 'I have never seen anything like before. It's a yes from me and the 2,000 girls in the audience.'
As Dylan picked up his clothes before walking off stage, Dannii quipped: 'He even cleans up after himself!'
The show was recorded in Melbourne before it was revealed Dannii was no longer an X Factor judge.