After Anne Hathaway learned that unintentionally revealing photos of her getting out of a car at the Monday premiere of “Les Misérables” had gone viral, the sassy actress took the wardrobe malfunction in stride. “I found out [about the pictures] just as I came in,” she was overheard saying to sympathetic guests at a Four Seasons restaurant luncheon for the film yesterday. “And I just thought, ‘OK, where’s the comedy?’ ” She added, “It has hit. It has landed. A bomb has gone off. I think what I am going to do is whatever my next appearance is . . . I’m going to step out of the car in a blanket. You’ve got to laugh at it.” Undaunted, Hathaway performed a pitch-perfect rendition of “Have Yourself a Merry Little Christmas” with her “Les Miz” castmates Hugh Jackman, Eddie Redmayne, Amanda Seyfried and Samantha Barks. Jackman then dedicated “The Way You Look Tonight” to his wife Deborra-Lee Furness, who visibly teared up as guest Anna Wintour beamed beside her.