PHOTOS: Exhausted, Justin Bieber avoids the fans and enter through the back door in Berlin!

Justin Bieber is in Berlin on Saturday, April 2. The singer will perform live tonight at the O2 World. The singer of 17 years is followed wherever she goes by crowds of screaming fans. But Bieber's trying to avoid all this euphoria over recent days.
The website Daily Mail reported that the star looked exhausted and had to sneak through the back door of the O2 Arena in Berlin on Saturday (2).
Today is the anniversary of Justin's mother, Pattie Mallette, who is with him on tour, but the celebrations will wait till later, since Bieber has an agenda to fulfill. The singer was bad a group of fans who were waiting at the entrance of the stadium to get the funds.
Check out the pictures of the star, this Saturday morning (2), Berlin: