Twenty Vietnamese hostesses were caught naked during a vice raid at a lounge in Joo Chiat.
The raid took place Wednesday (June 22) night around 9pm.
Plainclothes policemen who went to the bar saw hostesses serving customers in the nude.
A shop owner who worked nearby told The New Paper that the lounge was frequented by young Singaporean executives, and occasionally Caucasians.
The women were said to be aged between 19 and 34, and were arrested for immigration and vice-related offences.
It is believed to be the largest arrest made after vice raids in this area.