Fashion savvy Jessica Simpson leaves NYC’s Ritz Carlton Hotel with new fiance Eric Johnson looking stylish in her Mondo Guerra designed limited-edition tee shirt for Piperlime, which launched on December 1st in honor of World Aids Day. ‘Project Runway’s’ Mondo created these outrageously cool tee’s which are exclusively designed for and sold on www.piperlime.com for $50, with $20 of every tee sold benefiting amfAR, which has devoted itself to AIDS research.