Brian McFadden was seen taking aim at his former wife Kerry Katona during a recent Boyzlife performance, making several pointed remarks about their relationship.
The ex-Westlife star, who tours alongside Boyzone's Keith Duffy, told the audience he deliberately chose to wear white at their 2002 nuptials specifically to irritate her before making several other jokes at Ms Katona's expense.
"I wore white as well just to p*** her off," he quipped to the crowd in a video circulating online.
The 46-year-old then launched into a joke about the difficulties of visiting his children at Ms Katona's home.
Brian McFadden and Kerry Katona were married from 2002 to 2006
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"It's a f***ing nightmare getting parking outside her house on Father's Day," he said.
"I have to park at the f***ing NCP and walk two miles to her house. I've got f***ing two of those kids, surely I get a priority spot, no? Fast-track?"
Despite the barbed humour, Mr McFadden was quick to assure the audience that relations between the pair have thawed considerably.
"It's okay, it's okay, we're friends now, we're friends. I follow her on Facebook," he told the crowd.
Brian McFadden aimed several jibes at ex-wife Kerry Katona
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The Irish singer went on to speak warmly about the two daughters he shares with the Atomic Kitten star, Molly Marie, now 24, and Lilly-Sue, 23.
"We have two beautiful daughters, you know, they're not even little girls anymore, they're women," he said. "So we've kinda buried the hatchet, we've made friends."
However, he couldn't resist one final dig, adding: "Course I don't f***ing follow her on Facebook. Don't be ridiculous!"
The jokes drew mixed reactions from fans, with some finding the routine amusing while others branded his comments "disrespectful" and "disgusting."
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Brian McFadden made jokes about Kerry Katona on stage
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The couple's marriage was troubled from the outset, with Mr McFadden having admitted to being unfaithful with a lap dancer on the eve of their wedding during his stag night.
Their union lasted four years before they separated in 2006, with Ms Katona citing his cheating as the reason for their split.
The Atomic Kitten singer has since spoken candidly about how his betrayal affected her deeply, revealing it triggered childhood trauma linked to seeking approval from her mother, Sue, who struggled with mental health issues, and her time spent in foster care.
In a previous interview with The Mirror, Ms Katona described their entire relationship in stark terms: "It was just fake, it wasn't real, it wasn't meant to be - it wasn't what I wanted, it was all fake and phoney."
Kerry Katona and Brian McFadden in 2002
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Both have since found new partners. Mr McFadden wed Vogue Williams in 2012, though that marriage ended after five years.
He has been with Danielle Parkinson since 2016, with the pair becoming engaged in 2019 and marrying last year. They share a daughter, Ruby Jean.
Ms Katona, meanwhile, went on to marry twice more following her split from Mr McFadden.
She is currently in a relationship with personal trainer Paolo Margaglione after meeting him on Celebs Go Dating.
The singer has five children in total, including Heidi and Maxwell with ex-husband Mark Croft, and daughter DJ from her relationship with the late George Kay.
The 45-year-old has previously admitted she rarely sees her former husband now that their daughters are grown up, though she has expressed a desire for them to be closer.
Speaking on Matt Foister's Meeting... podcast, she said: "I really wish Brian and I were friends."