The 'Jar of Hearts' singer was apparently attempting to pull into a parking area at 2am local time on Friday, when a man opened up her driver's side door and shouted "move over".
The man then attempted to enter the vehicle, but Perri began to struggle as he attacked her and signalled her car horn several times until he fled, reports TMZ.
Police soon arrived on the scene and are currently investigating the matter, but the suspect has not yet been found.
Perri's spokesperson declined to comment on the incident.
The musician's hit single 'Jar of Hearts' reached the top 20 on the US singles chart and hit the top 5 in the UK in 2010.
'Jar of Hearts' has been featured on the television programmes Glee, So You Think You Can Dance and Pretty Little Liars.
Perri's first album lovestrong. was released in May.
> Christina Perri: 'Jar of Hearts changed life'
Watch Christina Perri's 'Jar of Hearts' music video below: