Sydney's exclusive Ivy nightclub was forced to close after riot police were called to a series of brawls that left a patron and a bouncer in hospital.
Two men were also arrested after the night of violence at the club, described on its website as a "glamorous urban oasis".
The first incident occurred at 2.15am (AEST) on Sunday when a security guard attempted to kick out a 28-year-old man, who suffered cuts to his head during the struggle.
Five minutes later a fight involving several men broke out and a 22-year-old and 17-year-old allegedly assaulted security guards as they tried to leave.
The men were arrested and taken to The Rocks Police Station.
The licensee agreed to close the premises at 3am but the fighting continued on the street, resulting in a security guard being taken to hospital with facial injuries.
Inquiries are continuing, including into how a minor came to be on the premises.
It's not the first time the Ivy has been associated with violent behaviour, with four Ivy bouncers sentenced last year over the bashing of a patron.
Ivy will return to normal trading on Monday.