Gretchen Jones may have won "Project Runway," but Mondo Guerra is the one with designs the stars are actually sporting!

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Jessica Simpson, who was a guest judge on the season finale of the show, was spotted wearing a Mondo for Piperlime tee last night while leaving the Ritz Carlton Hotel with fiance Eric Johnson last night in NYC.

The shirts were sold for $50 online yesterday, with $20 from each purchase benefiting amfAR in conjunction with World AIDS Day. The tee completely sold out.

Heidi Klum also threw support behind Mondo last month, when she wore his hotly debated polka-dot dress on the red carpet.

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