The Daily Telegraph has canceled a lifestyle column penned by Pippa Middleton, the sister-in-law of Britain's Prince William. Middleton began writing her "Sport and Social" column last September, but her contract has not been renewed. "The readers just weren't into it. There was a lot of negative mail coming in after each column and there were too many off-limit subjects for her. They ran out of ideas," a Telegraph source told Us Magazine. Middleton remains a contributor to Waitrose Kitchen and Vanity Fair magazines, however. Her sister, Kate, married Prince William in 2011.