Marc Jacobs & Jason Preston Squabble; GAP Limited-Edition Collaborations; Cashmere Underwear; Gucci, Chloé and Dunhill win in Counterfeit Suit; Christian Siriano Wins Big

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Marc Jacobs and beau Jason Preston's relationship hit the skids last week while on vacay in Turks and Caicos. Page Six reports that the "nonstop screaming matches" got so bad that they spent time apart and eventually cut the trip short--flying home on separate planes, of course. Fighting is no fun without the makeup sex. [Page Six]

Threeasfour, 3.1 Phillip Lim, Band of Outsiders, Michael Bastian and Philip Crangi will all create limited-edition collections for GAP this year, but they might be tough to find. If a designer designs a collection for GAP and nobody can find it, does it still make a splash? [Fashionista]

Would you buy a $250 pair of cashmere boxer briefs? Me neither. But the girls at The Frisky were so captivated by them that they went on their own expedition into the land of pima cotton and bulges in men's underwear. [The Frisky]

Gucci, Chloe and Dunhill won a $4.3 million judgment against a bag counterfeiter. Vendors on Canal St. don't bat an eyelash, they just get more creative. [WWD]

Christian Siriano just might be the most successful Project Runway alum yet! WWD reports that he now has financial backers for his line, Posh Spice in his clothes, and a scheduled appearance on Ugly Betty--and W Hotels gave him a bed. His response to all this newfound success? "Fierccccce!" [The Cut]