Pippa Middleton is Expecting Her First Child! The younger sister of Kate Middleton revealed in a ‘Waitrose Weekend’ column that she has already passed her first trimester. Pippa Middelton, in 'Waitrose Weekend' Pippa Middelton, in 'Waitrose Weekend' Middleton, who first gained recongition at her sister's wedding in 2011, married her husband James Matthews last May. Pippa Middelton, in 'Waitrose Weekend'