Kourtney Kardashian brought her two eldest children, Mason and Penelope Disick, and her niece, North West, to the Broadway musical Cats in NYC on Sunday night. The group hung out backstage and posed for photos with singer Leona Lewis, who currently stars as Grizabella the Glamour Cat in the stage production. While Kourtney was all smiles for the camera, the kids looked less enthused to be surrounded by giant felines; North and Penelope looked especially uninterested, though the stuffed kittens they held on to grabbed most of their attention. Kourtney was back on mommy duty after attending the Harper's Bazaar Icons event with her sisters Kim, Kendall, and Kylie on Friday. The reality star showed off her fit physique in a leggy black dress and shared an Instagram of herself in the sexy ensemble, writing, "New York I have arrived."