Together for four years and doting parents to son Patrick (3) and daughter Jane (2), Claire and Gerry exchanged vows in an intimate gathering.
The couple have been together for four years - with Gerry popping the question three years ago.
The newly-weds managed to keep their big day under wraps outside of their circle of close family and friends.
RTE host Claire (40) wore an elegant ivory shift dress with a cape to the registry office. She completed the look with a Jennifer Wrynne headpiece and open-toe shoes.
For the reception, Claire slipped into a sweeping satin gown with a plunging neckline from Knightsbridge Boutique in the Powerscourt Town Centre.
After posing for pictures, the happy couple headed into The Angler's Rest in Chapelizod for the reception.
Newstalk's Ivan Yates, Chris Donoghue, 'Today' host Maura Derrane and Fine Gael TD John Deasy all attended the low-key do.
Asked if she would be enjoying a "mini 'moon", Claire shook her head and added that she would be "straight back to work".
Some of the pair's celebrity friends have sent the couple their well wishes, with TV host Gráinne Seoige writing on social media: "Congratulations Claire and Gerry. Long life together and every happiness in the future."
Speaking of her wedding plans recently, the bride admitted that with her hectic work schedule she did not have time to plan a lavish ceremony.
"It will be low-key, with just family and close friends," she said.
"I have no intention of going shopping for a big wedding dress. Whenever I do it, I'm not going to be in a big gown. I've no time for any of that stuff now, so it'll all be streamlined - the celebrations, the wedding and the dress.
"Simple and easy is my motto at the moment, so we'll keep it all straight-forward."
The TV presenter said she knew her partner was 'the one' on their very first date.
"I had been around quite a while at that stage," she said. "I think at one stage I would have hated people to say 'when you know, you know' - but that was how it worked out.
"We had so many similarities in our background - size of family, rural upbringing, the values we were raised with."
Reminiscing on how he popped the question, Byrne admitted it was not the most romantic of gestures.
"He was loading the dishwasher and said 'will we get married so?', and I said to him 'are you proposing?' He said yes. And I said, 'yes, I will!' That was it."
They plan on taking a family trip to France soon with their children.