When Sylvia Jeffreys started dating Karl Stefanovic's brother, Peter, she no doubt knew she would be in for a lot of teasing from the Today Show host.

And on Wednesday, Karl made sure to publicly embarrass Sylvia when his mother Jenny featured on the Channel 9 show from Cairns with her 40-year-old son.

During a cross to Sylvia, who was sitting in the Sydney studio, the popular host turned to his mum and asked: 'What do you think of Sylvia?'

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'What do you think of Sylvia Jeffreys?' Karl Stefanovic asked his mother, Jenny, live on-air if she liked his brother Peter's girlfriend

Clearly mortified, the cameras crossed back to a shocked Sylvia, who was seen laughing off the embarrassment in her chair.

'She's lovely, she's gorgeous!' Jenny quickly responded, with Sylvia adding that she loved Jenny.

'I get along very well with Sylvia, she texts me,' Jenny added as a point to make with Karl.

Embarrassed: Clearly mortified, the cameras crossed back to a shocked Sylvia Jeffreys, who was seen laughing off the embarrassment in her chair

Sylvia and Peter started dating in December 2013 after they co-hosted the Today Show together over the Christmas holidays.

Since then the couple endured a long-distance relationship, with Peter returning from his post as Channel Nine's Europe, Middle East and Africa Correspondent in March this year in order to continue his career closer to home.

Speaking to Daily Mail Australia prior to Peter's return to Sydney earlier this year, Sylvia said she couldn't be happier that her long-time beau was leaving his foreign correspondent post in London.

'Lovely': Jenny quickly responded: 'She's lovely, she's gorgeous!' with Sylvia adding that she loved Jenny

And despite spending most of their relationship apart from one another, the stunning star said at Derby Day last year the couple hadn't struggled too much with the distance.

She said at the time: 'It's not hard at all, it's all good.'

Last year Sylvia spoke about marriage on the Today Show when she was a panelist discussing how fewer people in their 20s are walking down the aisle.

Karl made sure to ask Sylvia first what she thought of the trend.

'It's wonderful if you're lucky enough to have met the person at 25, I know most of my female friends are still single, most of my male friends are still single and will be for a long time before they get married.'

Loved up: Sylvia and Peter Stefanovic started dating in December 2013 after they co-hosted the Today Show together over the Christmas holidays

Not a struggle: And despite spending most of their relationship apart from one another, the stunning newsreader said at Derby Day last year the couple hadn't struggled too much with the distance

Karl used the opportunity to ask about her feelings on marriage.

'Is it [marriage] something you would consider in your future?,' he asked the new newsreader.

'I'd really like to keep my options open. Test the water,' she said her face contorting as she tried to resist laughing.

'Play the field?,' Karl jokingly asked, also adding: 'How fun is this?'