Marc Malkin

ABC/Adam Larkey; John Shearer/Getty Images

Christian Siriano says we shouldn't be surprised when we see Lindsay Lohan pop up as a guest judge on the new season of Project Runway.

No, it's not her collection of leggings that qualifies her to scrutinize the aspiring designers.

"Lindsay has probably been in editorial like Vogue, Harper's Bazaar and Vanity Fair more than any other actor," Siriano told me yesterday at L.A.'s Grove shopping mall, where he was promoting his new makeup line for Victoria's Secret.

"She really is a chameleon," he adds. "I probably have 20 covers that Lindsay's been on and been editorial in…she turns it out when she needs to."

As much as Siriano loves his Project Runway, however, he says he's slowly bidding auf Wiedersehen to the show that made him a household name...

He's quick to shoot down reports that he'll appear on Project Runway: All-Star Challenge, a two-hour special airing Aug. 20 on P.R.'s new home, Lifetime.

"Runway is amazing and I'm excited the new season is coming back, but for me, I'm ready to go away," he explained. "I've been doing so many other things, so it's time to kind of say goodbye."

Business aside, Siriano says he looks forward to the day when he can legally marry his longtime boyfriend, musician and photographer Brad Walsh. "Maybe we'll buy a farm or something," Siriano said.

But Farmer Ferosh he is not.

"I don't want to do all of the work," he laughed. "I want to raise alpaca or something. You know, make my own alpaca coating."

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See Christian Siriano having fun at his Victoria's Secret makeup launch with E! reality star Kim Kardashian!