According to TMZ, Ayda, 35, and 41-year-old Robbie’s former assistant Giles De Bonfilhs is taking legal action against her.
He claims that she subjected him to ‘inappropriate sexual questions’ and made him comment on her body while he worked for the couple.
But a representative for the couple has denied the claims. They told the Daily Mail: "The claims being made by a disgruntled former employee, after he was sacked for serious misconduct, are entirely without substance.
"Any proceedings will be strenuously defended. There will be no further comment on the matter as it is in the hands of the lawyers."
Giles also alleges that Ayda made him discuss his own sex life.
Although Robbie hasn’t been accused of harassment, he is thought have been named as a defendant.
The couple have two children, daughter Theodora Rose and son Charlton Valentine.
After dating for four years, Robbie and Ayda were married in 2010.