Hosting the Emeralds and Ivy charity ball in London, the Boyzone star was joined by Australian Storm Uechtritz, who recently moved to the UK to be near him.
The pair looked smitten with one another as they posed for pictures.
Moments later, the pop star was joined on the red carpet by his children Jack (13), Marie (11) and Ali (6).
Missing was wife Yvonne, who had been by his side at the same gala event last year. The couple announced their marriage was over last April.
Earlier this year, Ronan revealed that the hardest part of the split was breaking the news to his children.
"Whether we like it or not, this has happened. This is the change and this is what we have to do. They (the children) are our priority so it's all about making sure they don't get affected too much," Keating told the Irish Independent last June.
The singer's co-host for the night was presenter Christine Bleakley, who looked stunning in a black, floor-length gown.
Guests, including singer Katie Melua and 'X Factor' evictee Rylan Clark, were greeted by a champagne reception, before a three-course meal and live music from Keating, 'X Factor' singer Lucy Spraggan and boy band Lawson.