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The bawdy quip came during a segment where Paul was telling Prue how to make a Horn of Plenty, a traditional Scandinavian dessert made from eggs, almonds and sugar, and held together with caramel.
Watch the full clip here:
As the judges discussed the suggestively shaped pud, Paul asked: "So Prue, do you want to try some of my horn?"
Prue appeared to hesitate before saying yes.
"You can have that piece," continued Paul, breaking off the tip of the horn and passing it to Prue on a plate.
Right on cue, tweets flooded in from viewers who'd picked up on the dessert-themed innuendo.
"Paul Hollywood asking Prue Leith if she would like some of his horn?! Classic Bake Off innuendo!" commented one.
Another wrote: "Horn of plenty? #GBBO excelling itself tonight. And Paul asking Prue if she'd like a bit of his horn...."
While a third commentator thought Paul had overstepped the mark, asking: "Did anyone else find Paul's offer of his horn to Prue ever so slightly creepy and ill-judged?"
Elaborating on how to make the cone-shaped Scandi pud, Paul explained: "It's the perfect challenge, I think, for the bakers, it's got no flour in this so it's supposed to be ground almonds in there."
"Once you've actually made the dough, you've got to divide it up and then they've got to shake it," he added.
Last night's episode saw the shock elimination of fan-favourite Hermine, who was sent home despite having been crowned star baker twice this series.
Instead, bakers Peter, Dave and Laura all made it through to the final next week.
Twitter was filled with comments about the decision, with many saying Hermine was "robbed" of her place in the final.
One wrote: "Wrong decision. Laura has made so many mistakes she should have gone this week. Hermine didn't deserve to go."
While another tweeted: "Hermine's beautiful bakes were ignored. A massively wrong decision. The show has lost its lovely, innocent sparkle."
We're so sad to see Hermione leave - GBBO won't be the same without her.
Roll on the final for rising tensions and another serving of innuendos.
Featured Image Credit: GBBO / Channel 4
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