The unusual information has come out seven years after they ended their seven-year relationship.
Controversial Aussie KIIS FM presenter Kyle Sandilands made the shock revelation on his radio show.
Speaking of his pals he said: "I remember when I’d have them around my house
"And they were in love and sometimes would spit in each other’s mouths."
Elaborating on the baffling statement, he explained: "Delta would sit with her mouth open
"And Brian would spit into her mouth and Delta would spit back into his mouth."
He went on to explain that they justified it as "Fun, they said fun.
"I always thought, 'Wow! That’s weird'."
The couple started dating in 2004 and even got engaged before calling it quits in 2011.
The bizarre detail comes as the former Westlife star confirmed that he was the latest celebrity to sign up to Dancing On Ice.
The The 38-year-old appeared on ITV's Lorraine via video link to share the news, after The Sun Online revealed he signed on the dotted line last week.
The Sun's Dan Wootton revealed the news to Lorraine Kelly before Kerry Katona's ex husband said: "Hi Lorraine. Well yes the news is true. I am going to be doing Dancing On Ice 2018.
"I'm very excited, I've already been practising outside in the garden on me roller blades.
"Me mammy says I am a one man Torvill and Dean! Watch this space."
The Irish outfit have opted for the Universal stable rather than X Factor star Cowell’s own company.
Tour dates and some new material are also in the pipeline.
A source said: “Simon wanted a Westlife reunion but only with something extra to bring fans back.
“That meant Brian and his unpredictability. It would give the Westlife reunion the tension it needs.”
However, the deal collapsed when one member of Westlife refused to be a Fool Again and pulled out because of McFadden.
Leaving a gutted Brian, who can only reminisce about his Seasons In The Sun, to tweet: “Ego is destroying a full Westlife reunion but I completely understand the group see themselves as a four piece.”
In the last number of years Brian McFadden has toured the UK and Ireland with Keith Duffy with a manband mash-up group called Boyzlife.
Before they disbanded in 2012, Westlife accumulated 14 number one singles in the UK as well as 50 million record sales worldwide.
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