Fans of the couple went wild for Guy's joke.
"@guysebastian you’re a brave man!!" laughed one fan.
"Guy Sebastian you might be on the lounge tonight my friend," another jokingly commented.
"@julessebastian his talents have no end! A comedian also," noted a third.
Teenage sweethearts Guy and Jules have been married since 2008 and share sons Hudson, nine and Archer, six.
“Our relationship isn’t perfect but I think our success comes down to the fact that we still really like each other,” she explained. “If something is wrong, Guy can’t go to bed without getting all his thoughts and feelings out and it’s something that I’ve learned is a better way.”
Whilst he doesn't mind making the odd joke about his wife, Guy has admitted that Jules is his "anchor" and "the ultimate equaliser".
“When you’ve got someone who you have history with, you have to be yourself. Sometimes when you meet someone at a certain stage of your life, you can be the version of yourself that you want to be to that person, there is no history they can hold you accountable to,” he told WHO last June.
“My wife has known me since I was 12 years old. She knows my family. She knows my background. So, she’s always brought me back down to earth. I see myself when I look at her. Not that she purposefully holds a mirror up to me, but I’ve never had a persona like (Beyoncé’s) Sasha Fierce. I’ve just navigated through this with the objective of making the most of the opportunity.”