Tim Gunn, the avuncular mentor on Project Runway and creative director of Liz Claiborne, might be the last person you’d expect to dish cattily and gossip about his colleagues. But that’s exactly what he’s rumored to do in his new book, in stores today, Sept. 7.

“My deathly ill mother, if she’s alive Tuesday, won’t be Wednesday,” Gunn said about the explosiveness of some of his observations in Gunn’s Golden Rules, including Gunn’s suspicion that his father was a closeted gay man who had a sexual relationship with former FBI director J. Edgar Hoover. Among the other revelations:

• “I keep thinking Martha Stewart will never have me back on her show again. I mean, I love her. It’s her bratty daughter who troubles me so, and especially because Alexis is so willing to do this in public.”

• About Gretchen Jones, a contestant on the current season of Project Runway: “The behavior that Gretchen demonstrated on the runway during that Q with the judges is about as close to psychosis as anything I have seen on the show. … I would have sent Gretchen home! I probably would have been mistaken but that’s what I would have done.”

The enitre interview, which appears on the Web site TheFrisky.com, can be read here.