Eagle-eyed viewers pointed out the telly presenter, 56, was chugging an energy drink on camera while Graeme Swann was being interviewed about his score, despite the BBC being known for never showing branding.
The star – who was booted from the show last night – was standing to one side watching the former cricketer and his partner Oti Mabuse talked to host Claudia Winkleman about his score.
She was seen lifting the can to her lips and having a good drink before holding the can in front of her as she watched the interview – but it didn't give her wings as she was booted off the show first.
Susannah, who later had a tantrum backstage, soon seemed to realise her mistake as put her hand down and tried to hide the can.
The channel is renowned for its impartiality and eagerness to avoid including branding in its programmes unless absolutely necessary.
Noticing the error, which could land her in trouble, viewers rushed to Twitter to point it out.
One wrote: "Did anyone else notice Susanna was drinking a can (not sure what drink, maybe a fizzy drink or red ball or something) during Graeme and Oti's scores?"
Another added: "Did anyone else just see Susannah drinking a can of RedBull then hiding it when she realised she was being filmed?? #SCD #Strictly."
A third tweeted: "Susannah blatantly drinking Red Bull in the background #scd #strictly."
It comes after Italian hunk Giovanni Pernice was training for Saturday night's dance with Faye Tozer wearing a black All Saints 'Tonic vest'.
The £20 item of clothing features the trendy brand's recognisable ram skull logo.
A source told the Daily Star: "This is quite a blunder. It shouldn’t have happened.
"The logo could clearly be seen, which is a breach of guidelines.
“Everyone invited to appear on the BBC is told not to wear branded clothing, but its stars should already know the rules.
“Producers are likely to be extra careful in future."
The BBC's own product prominence guidelines state that there must be "strong editorial reasons for repeated references to a brand".
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