Gwyneth Paltrow gathered her A-List pals together in NYC last night for a party in honor of her new cookbook My Father's Daughter. Her husband, Chris Martin, made a hasty exit from the bash while other friends like Jay-Z, Michael Stipe, Jerry Seinfeld, Martha Stewart, Mario Batali, and her mom, Blythe Danner, seemed happy to smile for the assembled photographers. The book hits shelves nationwide tomorrow, though Gwyneth started promoting it as long ago as last year with in a memorable Vogue article. She's not the only one in her social circle with a new project to celebrate. Jay-Z's new website, Life + Times, recently launched, and Gwyneth granted him an interview to help kick things off. He asked about Gwyneth's newfound love of singing, and she said, "I kind of always sang. My mother has a great voice and was always singing jazz around the house, and I think she passed on her musicality to my brother and myself. I sang in an a capella singing group, and I always thought that somewhere down the line I would dust off my pipes and use them, but I didn’t know I would be so old when it happened." Jay returned the favor by speaking to Gwyneth's GOOP newsletter about his assorted ventures. She asked why he's "so f-ing cool," and Jay replied, "I'm around great women, starting with my mom. Women keep men cool. The hotter the chick, the cooler the guy. . . that sounds like a really bad rap line!"