Justin Bieber and Selena Gomez were recently photographed holding hands in Los Angeles, fueling rumors of a possible romance that surfaced late last year.
Bieber, a 16-year-old pop star whose documentary "Never Say Never" hits theaters on Friday, and Gomez, the 18-year-old star of the Disney Channel series "Wizards of Waverly Place," have not commented on the pictures, which were published on the PopSugar website.
Gomez has said in the past it would be "illegal" for her to hook up with the underage singer.
Bieber is so popular that he usually has scores of young girls following him around. Several of his fans sent Gomez threatening Twitter messages last month after she and Bieber were spotted kissing and getting grabby in the Caribbean. In December, they were seen having breakfast at an IHOP restaurant.
Last year, some Bieber fans also attacked reality star Kim Kardashian on Twitter after she and the pop star posed for an Elle magazine photo shoot.