Emma Roberts was arrested for allegedly assaulting her boyfriend Evan Peters last week.

The 'Scream 4' actress - who has been dating her 'American Horror Story' co-star for over a year - was detained by police in the early hours of July 7 after guests at a hotel in Montreal, Canada, reported a disturbance coming from the room they shared.

However, a source close to the 22-year-old actress insists both parties were to blame and Emma was solely arrested because Evan's injuries appeared worse than hers.

Evan, who was left with a bloody nose following the altercation and a supposed bite mark, did not press charges against his girlfriend - who is the niece of 'Pretty Woman' actress, Julia Roberts.

A police source told nydailynews.com the pair had ''light injuries'' when they reached the scene and that the case is now closed.

A statement to US Weekly from a rep for the couple read: ''It was an unfortunate incident and misunderstanding.''

The rep added that the couple ''are working together to move past it.'' Emma was seen out in public since the incident, sporting bruises on her legs.