The Baby hitmaker began dating the singer/actress in 2010 and their romance has been patchy ever since. They have been spotted on a number of occasions this year but have not commented on their relationship status.
The two young stars were previously spotted at Dave & Buster's restaurant in Los Angeles on Monday night and they have since embarked on a trip to Ontario where Bieber was raised and his father still lives.
According to E! News, the pair visited a Tim Horton's restaurant on Wednesday to order takeout food but did not speak to each other inside and left in separate cars.
A source tells Usmagazine.com, "They are doing what they are doing... She doesn't care, she doesn't define it."
Bieber also posted a black and white 'selfie' image of the pair on Instagram.com that evening.