She is believed to have made lakhs of rupees and gathered a lot of gold jewellery in the course of her serial marriages.
In one case, Chennai motor mechanic Manikandan, a Hindu, went against his parents' wishes to marry Shahnaz, a Muslim, only to realise that he had been duped like many others before him.
"Shahnaz has confessed to marrying only four and not 50 or 100 men as TV channels have reported," said a police officer.
The police produced Shahnaz before the Saidapet magistrate who remanded her in judicial custody for 14 days on Sunday.
TV channels have reported that Shahnaz married close to 100 men during her decade-long innings as a con artiste but the police estimated the number at a modest 12.
Shahnaz's began her career from Pathanamthitta in Kerala 11 years ago when she married a man named Siddique. Her last known marriage was in March this year to Prasanna, a football player and sports goods salesman in Chennai.