There was the usual phalanx of celebs at the Ross School in East Hampton Saturday for James Taylor's penultimate concert in the Hampton Social series — the Olsens, Richard Gere, Jimmy Buffett, Daryl Hannah, even Paul McCartney — but, as it turned out, they weren't all necessarily there to see Sweet Baby James. "I don't know much of his music," James Blunt admitted to us before the show started, "but I'm looking forward to it." So no favorite songs, then? "I'll have to get back to you at the end of the night," he said. Mischa Barton was equally flummoxed. "Um, I don't know," she admitted. "Everyone's been asking me. I put it on my iPod before we left, but I haven't listened." Beth Ostrosky, there with her boyfriend, Howard Stern, was one of the few who could answer the question. "'You've Got a Friend,'" she said proudly. And local gal Christie Brinkley eventually came up with an answer, too. "I sing the kids this song at night to help put them to sleep," she said. "I don't know what it's called, but it goes, 'There is a young cowboy…' Oh, 'Sweet Baby James,' that's it." Yup. —Brett Amelkin