Kylie Jenner Flaunts Her Abs in This Racy Bikini Selfie

It wouldn't be a Kardashian-Jenner Summer weekend without a pool day. On Sunday, Kylie Jenner slipped into a bikini to relax with her eldest sister, Kourtney Kardashian. Although she didn't share pictures of their fun in the sun, Kylie was sure to take a selfie that put her bikini body and black two-piece in perfect focus. "Kourt & Ky swim session," Kylie wrote in the picture.

In another post, the reality star promoted her upcoming birthday celebration in Montreal on Aug. 18, which is 10 days after she turns 18. "hello Canada. My birthday is coming up & well thank you @team.productions and @oli_beachclub for having me in to celebrate," she said. "can't wait to party at #beachclub #montreal #whoismrsmith."

It's been a couple weeks since Kylie and sister Kendall Jenner's revealing afternoon at the pool made its way onto Instagram. After you're done checking out these latest pictures, catch up on Kylie's raciest photos on Instagram.