Big Sean performed his first London concert at Cargo the other night and during the final song of the night, the G.O.O.D. Music artist performed "Marvin and Chardonnay". Kanye West then surprised everyone by jumping onstage with Sean and as you can see from the footage, the crowd went insane.

Check out the video below and also click here for the interview with Big Sean in the Club 93-7 studio back in May. One question: Why does Big Sean not wear a shirt when he weights 100lbs?