Checkmates! Kelly Osbourne and Lourdes Leon wear complementary black and white to Zac Posen's New York show... while Naomi Campbell thrills in frills

By AMELIA PROUD Material Girls: Kelly Osbourne and Lourdes Maria Ciccone Leon attend the Zac Posen Spring 2013 fashion show during Mercedes-Benz Fashion Week at Avery Fisher Hall, Lincoln CenterThey've worked together on a line inspired by Lourdes' mother Madonna's hit Material Girl, and she and Kelly Osbourne made quite the team for a huge fashion event in Manhattan tonight. The musical