It will be an exciting festive season this year for the couple as they await the arrival of the little bundle of joy, which they are expecting early in 2015.
"So I know it's early, but myself & @johnmcguire72 already know how we're spending NYE...waiting to meet Baby McGuire", the beauty tweeted.
Karen wed her businessman husband John McGuire in romantic Sicily in June last year. Their plans to return to Italy later this month to properly celebrate their anniversary will serve as a double celebration now that the pair are on track to start a family.
Her TV3 pals rushed to congratulate the new mum-to-be on Twitter last night. News of Karen's pregnancy comes amid a whirlwind of weddings and new arrivals among the Xpose ladies.
Karen's co-host Michelle Doherty, who joined the show to cover Aisling O'Loughlin's maternity leave, is awaiting the arrival of her first baby in August.