Taking to social media, Ben and his wife Jackie Smith Foden share videos of the family enjoying a day out at Winter Wonderland in London.
The kids enjoyed fairground rides before joining their father for ice skating.
Ben has been practicing his skills on the ice ahead of taking part in Dancing on Ice early next year.
The reunion comes as the two children have had difficulty travelling to the US earlier this year due to Covid-19 restrictions.
Tadgh (6) and Aoife Belle (9) were denied entry to the country in July of this year as the US banned visitors from Ireland
Jackie then flew back to Dublin to bring the children home where she was stopped by immigration and denied entry to Ireland.
By August however, they were able to finally visit their father, and their new half-sister Farrah.
Ben and Jackie welcomed their first child together in May 2020 after tying the knot in August 2019 after two weeks of dating.
Ben split from wife of six years Una Healy in 2018 after he admitted that he cheated on her.
In an interview with The Guardian he said: "At the moment anything that's published about me is never very good and pretty rightly so, because I was the one who committed adultery.”
"But at the same time, it wasn't the only reason for our divorce to go through," he added. "It's not ideal but we're very amicable, we're getting through it. We're not the first people in the world to get divorced. We've got two little kids we adore."
Una and the kids moved home to her native Tipperary last year after years of living in the UK. She admitted that while that being a full-time, single mum and balancing her work life is difficult, she’s in a good place.
“It was a different chapter when I was with the girls,” she told The Sun speaking about her time as a member of The Saturdays.
“We were constantly on the road and were hardly ever home. We literally had a single out every three months; we were on that promo trail all the time. It’s a very different time.
“I’m juggling being a working mum and a full-time mum at the same time because, you know, I have to plan their diaries and the help I get from my parents when I’m working.
“It’s different, but I’m in a good place now with my life and being able to juggle the whole lot, you know.”