Last night on Late Show with David Letterman, Bill Clinton sings Gaga the highest praises, and hopes that she come in proper form to his October 15 fund-raiser at the Hollywood Bowl. “In deference to my diet, she will be meatless that night,†says the vegetarian former president. Plus: Rob Lowe coincidentally does his best Bill Clinton impression — you decide if it’s dead-on; Alan Cumming divulges his curious shallowness: “When I’m on a plane with another famous person, I always think, if this went down, what billing would I get?â€; and Bill Jim Parsons contemplates retirement on a grape farm. Watch our compilation to see what you missed.