Tiësto was rocking the decks in his usual fashion over the weekend in Toronto. The crowd of 4,000+ were given an extra special treat as Diddy hit the stage during Tiësto's own epic floor-filler 'Dance4Life.' The track is a call for unity in building awareness of the HIV/AIDS struggle. Diddy seems to be omnipresent, popping up everywhere in any city, but at least this one was for a good cause. What's next? Diddy on a Tiësto track? He tried that with Felix and it was pretty awful. Check out the photo of Diddy and Tiësto exchanging digits.