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The Girls Aloud singer previously went viral for her pronunciation of the word on an episode of Sunday Brunch in 2010, as viewers were charmed by her thick Derry accent.
And viewers once again went wild for the singer's use of the word 'fleeourr' on the charity special which aired on Channel 4 last night.
When baking choux buns for the baking show's signature round, she read out the ingredients and method, and fans who'd been eagerly hoping she'd say the word again were delighted.
"Butter and then we do the flour," she said, and viewers went into a frenzy, taking to Twitter to sing her praises.
"Everyone waiting for Nadine Coyle to say 'flour' during Celebrity Bake Off," said one Twitter user.
Meanwhile, another wrote: "Can't believe we've been blessed with Nadine Coyle saying Flour again."
"Nadine Coyle just said 'flour' on Celebrity Bake Off and I can't breathe," said a third.
While others were overjoyed at the singer's use of the word: "As if #GBBO got Nadine to say 'flouer' 3 minutes in. Incredible memory."
"Nadine has just said flour again. I am happy," another wrote.
The celebrity special of The Great British Bake Off saw 20 famous faces try their hand out at baking, from the technical challenge to the signature round.
Celebs this year included actor James McAvoy, comedian Katherine Ryan, presenter Stacey Dooley and actress Daisy Ridley, as well as Nadine Coyle.
Catch up with all episodes of Celebrity Bake Off for Stand Up To Cancer on Channel 4 now.
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