The troubles of Auburn's colourful deputy mayor have extended to the home front, as police investigate an allegation of domestic violence between Salim Mehajer and his wife, Aysha.

Speculation about the couple has swirled since A Current Affair reported this month that Mrs Mehajer had quit the marital home in Lidcombe and returned to live with family in Wollongong, where she worked as a beautician named April Learmonth before her transformation into the glamorous wife of Sydney's most controversial councillor.

Mr Mehajer dismissed the report as an April Fool's joke.

But police have confirmed that an investigation is under way following a "domestic violence incident" involving a 29-year-old man in Horsley, a suburb of Wollongong, on Monday night and officers have interviewed several witnesses.