Justin Bieber unwittingly committed a no-no by standing on the Blackhawks' logo in their dressing room at the United Center on Tuesday night.

The 19-year-old Bieber was posing for pictures with the Stanley Cup, which the Blackhawks won on June 24.  What upset some fans on Twitter was a picture of the pop star standing on the team's Indian head logo while he was taking his own picture of the Cup.

"Bieber was very excited to see the Stanley Cup when he entered our locker room last night," said Brandon Faber, Blackhawks' senior director of media and community relations.

Bieber was apologetic and understanding of the tradition but continued to take photos.