As cocky as Kanye West might be, he certainly is putting in the promotional work with performances at parties from coast to coast. He's getting paid, of course. But still. Last night he graced the Sidekick LX launch party with his musical stylings, no doubt rocking the crowd of semi-famous people. More pics from the party after the jump. And dare I say Nick Cannon seems a bit lackluster? He must not be taking his fake breakup from his fake fiancee very well.