"Some people just can't let go of the past. Even if it destroys the future," began 32-year-old Brian's Twitter rant last night.
"I love my kids but they're the best thing in my life that came from that shambolic relationship.
"Now please f--- off and let me and my wife enjoy our life. With my two girls... And to everyone else. Mind your own business.
"I'm sick of every time in my life I'm happy some p---- tries to destroy me."
Brian recently tied the knot with his second wife, Irish model Vogue Williams. In an interview with Hello he admitted, "I was 18 or 19 when I got married the first time. I was in Westlife. I had no idea what I was doing. It wasn't till I was 30 that I turned into an adult."
His ex-wife Kerry, the mother of his two children, responded angrily on Twitter.
"I will never let anyone take away my first marriage not even my ex-husband!" she wrote.
"We may have been young but I knew full well what I was doing!!! And never in a million years would I ever dismiss it, especially bringing two amazing children into it."
Brian didn't take kindly to Kerry's tweets though, as proven by his own furious rant.
You'd think he would have learnt by now how to keep his mouth and his Twitter account shut after going through an all-too similar war of words with recent ex Delta Goodrem.