Ponzi schemer Bernie Madoff was “inappropriately letchy,” according to his son Andrew’s fiancee, Catherine Hooper. “He came up behind me at Christmas and grabbed my butt,” she said Wednesday at a Marie Claire-hosted book event, where she discussed Laurie Sandell’s tome, “Truth and Consequences: Life Inside the Madoff Family.” “When I told Andrew about it, he said, ‘That’s so weird, that’s so creepy. Let’s never talk about it again,’ ” Hooper related, adding, “With the women at the firm, friends of the family, yeah, he [Bernie] was inappropriately letchy.” Sandell, who worked extensively with Hooper, Andrew and matriarch Ruth on the book, recalled that Bernie’s wife, who was left with $2.5 million, slept on her couch for five nights. “Her financial future is entirely uncertain because settlements are ongoing,” Sandell said. “She’s on a very limited budget . . . and certainly was not going to stay at a hotel . . . She loved to go to TJ Maxx.” Amid the writing of Sandell’s sympathetic book about the family, Mark Madoff’s widow, Stephanie Madoff Mack, raced to put out her own book, “The End of Normal,” which bashes the clan. Hooper said, “[Stephanie] said she wasn’t working on a book . . . later, the publication date of her book got announced . . . and then when we announced our publication date, she and her publisher moved up their date ahead of ours. So we just weren’t going to play that game of, ‘Oh, we’ll move up our date too.’ ”