The richest man in Illinois invited pop star Katy Perry to play the 25th anniversary party of his Chicago hedge fund, Citadel. Perry allegedly charges $500,000 per set and played at this year’s Super Bowl, but money is no object for Griffin. The hedge fund billionaire recently finalized a divorce, and is still worth $7.1 billion, according to DNA Info. Left Shark performed alongside Perry at a lavish bash which took place just a few weeks after Griffin’s birthday. Perry was obviously not chosen for her politics, with the staunch Clinton supporter singing at a bash organized by the generally...