Beiber in the buff, pop star pranks his grandmother

Justin Bieber performs in New York, Nov.7, 2012. (AP / Invision / THE CANADIAN PRESS)

Some are calling it sweet, others and odd encounter. Which every way you see it Beiber fans got an eye full after newly revealed images show the 19-year-old completely naked apart from a guitar covering his private parts.

In the TMZ pictures the teenage singer stands in the hallway completely nude with strategically place guitar. Another picture shows the naked Biebs from behind with a guitar held in front.

According to TMZ this happened in Toronto during a Thanksgiving visit to his grandmother's home.

The surprise naked performance for his Nan, is being reported as a prank. However the grown-up heart-throb is getting mixed reactions from fans.