For one brief moment, Kanye West [1] was spotted laughing and enjoying himself, but he quickly turned his smile into a frown when he realized he was on camera. The rapper was back in his hometown, Chicago, watching the Bulls play the Cleveland Cavaliers, and in a Vine that's gone viral [2], he's seen chatting with former Bulls player Scottie Pippen, flashing a grin before putting on a straight face. During the game, Kanye also made his way on to the court to perform "All Day."

Although he wasn't with his wife, Kim Kardashian [3], on Mother's Day [4], he made his love for her known with some big, romantic gestures. Kim took to Instagram to say that Kanye had a string quartet play Sam Smith songs for her [5] at a restaurant. Check out the viral Vine above, and since Kanye is among the nominees, cast your vote in our POP 100 poll [6] to pick your favorite musician of the year!