Pictures published by The Scottish Sun show the nationalist politician speaking to several elderly people in a pub without wearing a face mask.
Confronted about the incident Ms Sturgeon admitted she was “in the wrong” and claimed to be “kicking herself” over the lapse in rules.
She added: “This was a stupid mistake and I’m really sorry.”
Under laws passed by the SNP it is illegal in Scotland to go maskless in a pub or bar unless you are sitting at a table.
The incident took place last week at the Stable Bar and Restaurant in Mortonhall, Edinburgh.
Speaking to the Sun one of the pub’s patrons said they were shocked to see the SNP leader breaking Scottish government law.
More to follow…