A source told The Sun: "He is very upset. This is devastating for him. A complaint has been received and is being taken very seriously.
"Bruno has been asked to give an account of what happened and that is being checked against the woman's statement.
"He doesn't even know what she is alleging beyond inappropriate conduct. There has been no announcement to cast and crew. Police are not involved at this stage."
The father-of-one split from partner Victoria Roscoe in 2013 and has since spoken of how he always 'tries to be a gentleman' when talking to the opposite sex.
MailOnline has contacted Bruno's representatives for comment.
On screen, Bruno plays bad boy Todd, Corrie's first openly gay character.
But in real life he is a devoted dad to Freddie, 10, his son with his ex-girlfriend.
He has previously said: 'I love being a dad. I have him to stay as much as I can."