The pop superstar came on during the Chicago MC's Sunday afternoon set
Producer Paz pranked Bieber by swapping copies of their albums
The pop singer wasn't present at the ceremony to collect his gong
Comedy actor criticises Bieber during appearance on US TV show 'Watch What Happens Live'
The pop star is being sued by a photographer
The singer faces charges of driving under the influence
He appeared at his manager's label's showcase gig at Banger's Sausage House & Beer Garden
Leaked testimony shows Bieber’s anger at questions over relationship with Selena Gomez
Parts of the video have been blocked out to protect the singer's privacy
The pop star's genitals will be censored to respect his privacy