The Killiney native is due to welcome her first child with businessman husband John McGuire, who she married in June 2013, in the early New Year. The Xpose host told the Herald that so far her pregnancy has been a breeze and that she's feeling fantastic.
"I'm feeling great thank goodness and I'm halfway through," she said.
"It's honestly like a detox being pregnant because you're not drinking, you're looking after yourself more, and you're eating better and exercising.
"So I'm very lucky, I'm blessed.
TV3 anchor Karen and her other half have decided to keep the sex of the baby a surprise and are currently preparing a nursery at their new Dublin home.
Karen said she has yet to decide when to finish up on maternity leave, but will be spending December 25 gearing up for parenthood. and the pitter-patter of tiny feet.
"I haven't honed in on a date yet, I'll see how I get on," she said.
For the moment, blonde Karen's waiting to hear news of Michelle Doherty's little addition.
Phantom FM DJ Michelle, who filled in for Aisling O'Loughlin on Xpose for six months earlier this year, is due to give birth in London in the coming days.
"She's literally ready to go so we're on stand-by to hear how she gets on," Karen said.
"As soon as I knew I was pregnant but still couldn't say anything I was hawk eyed on her.
"I was trying to leave it as long as I could to say it, but being on telly I was started to feel really uncomfortable in certain dresses, so it was a real weight off my shoulders when I could finally talk openly about it," she added.
Karen and hubby John toasted their anniversary in Sicily where they said 'I Do' a year ago.