BORN-AGAIN CHRISTIAN: Saks Fifth Avenue has picked up “Project Runway” winner Christian Siriano’s fall collection for its flagship store’s new third-floor boutique featuring up-and-coming designers. Siriano has also teamed up with pal Marta Abrams and her partner Elise Rosemarin to up the fashion quotient at the West Coast-based maternity loungewear line Moody Mamas. The aptly named spin-off collection, Fierce Mamas, features chiffon dresses, jersey T-shirts, cotton maxi dresses and linen separates. The spring collection ranges from $25 to $112 wholesale and is available at Nordstrom and specialty stores nationwide. The partnership will continue through fall. To top it off, Siriano has signed on to create costumes for the Uma Thurman flick “Eloise in Paris” that begins filming this summer in Barcelona and Paris. “I have my hands in all these little worlds to make my brand real,” Siriano said. “It’s been a real struggle, especially with this economy, but I think it’s starting to pay off.”
ROOM SERVICE: This just inn: Christian Lacroix, who already designed two hotels in Paris, is starting on his third. The couturier said construction starts today to overhaul the hotel at No. 1 Quai St. Michel, right in front of the Notre Dame church.