Project Runway winner Christian Siriano is trying to stretch his fifteen minutes out as long as he can. PR devotees will be all over his guest role on ABC’s Ugly Betty on May 1.

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The plot: Mode magazine is trying to convince Christian to work with them for a fashion spread instead of their competitors. So the designer shows up for a meeting with an entourage of models wearing his designs and Runway judge Nina Garcia, who also plays herself on the episode. In addition to the outfits he designed for his model pals, the Runway winner also whipped up a look for Becki Newton (Amanda) — who happens to be a huge Christian fan.

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The wunderkind designer says the experience was “fierce!” Natch.

So, who was the fiercest cast member of them all? “Ooooh, they’re as fierce and ferocious as they can be,” raves Siriano. “Vanessa Williams is the queen of fierceness and Becki Newton is the princess … I’m inviting them all to my Spring 2008-09 collection — it’ll be a great front row!”