UFC champ Anderson Silva uses his shoulder to hit Chael Sonnen's jaw at UFC 148 weigh-ins

During the UFC 148 weigh-ins on Friday afternoon, UFC middleweight champion Anderson Silva got in the face of Chael Sonnen and hit him with a shoulder bump to the jaw.

Their much anticipated rematch is Saturday night and can be seen live on pay per view. Fans can expect more fireworks when these two heated rivals get inside the cage.