Kylie Jenner has shut down pregnancy speculation by posting a selfie video exposing her toned stomach to her Instagram Stories on Thursday.The KUWTK star, 26, posed in the mirror amid rumours that she's expecting a baby with her new boyfriend Timothee Chalamet, 28. Rumours the pair are expecting a child have been circulating on social media this week, but the Kylie Cosmetics icon quashed the online theories in new videos posted to her 400 million followers. For one clip, Kylie filmed herself showing off an outfit from her new clothing brand, Khy, with low-rise jeans and a one-shoulder top which exposed a glimpse of her toned stomach.