It was alleged that the young woman, who has not been identified, had collapsed but had refused to be taken to hospital.
Gossip site TMZ wrote that alcohol had been a factor in the incident, despite the girl reportedly being under the age of 21, with 21 being the legal drinking age in the US.
A source told the MailOnline that an ambulance was called ‘out of caution’ but that the young woman regained consciousness and ‘turned out to be fine.’
Since Justin moved into his $6.5 million mansion in Calabasas, a suburb of Los Angeles, he has become known for his house parties.
Guests are apparently forced to sign waivers before entering the premises and are banned from talking about 'physical health, or the philosophical, spiritual or other views or characteristics.'
This latest story comes following a tumultuous year for the teen music sensation.
After splitting from his girlfriend- singer Selena Gomez- at the start of the year Justin faced reports that he had visited a brothel in South America. A female fan then released a video of the singer asleep in his hotel room before spilling details of their alleged rendezvous.
Justin also angered Argentinian fans after a video emerged of him kicking the country’s flags. He took to Twitter to apologise for the incident.