"Here are some behind the scenes of our Balmain ad campaign shoot in NYC! This is me & @olivier_rousteing discussing some looks before the hair & make up began," the fashionista wrote this morning. In the accompanying pics, Kim models some seriously sexy dresses. One of the cleavage-baring ensembles even showcases some major side boob. VIDEO: Kris Jenner copies Kim's style Instagram One particularly revealing cutout dress even had Kanye West smiling from ear to ear! "He's happy about this look!" Kim captured the cute snapshot.