Kim K Rocked a More Casual Look on April 17 at a Bowling Party for Sister Kourtney Kardashian's Birthday. She Showed off Her Baby Bump in a Fitted Black T-Shirt and Distressed Boyfriend-Style Jeans. Vote -- Is Her Outfit Fierce or Frumpy? Kim Kardashian Celebrated Older Sister Kourtney Kardashian's 34Th Birthday with Her Family at a Nearby Bowling Alley, and Was Dressed Casual Chic for the Occasion! the Mom-to-Be Showed off Her 6-Month Baby Bump in Loose, Boyfriend-Style Jeans and a Tight Black T-Shirt.