"Kourt & Ky swim session."

Sunday is for swimming.

Kylie Jenner slipped into a black bikini Sunday for some pool time with sister Kourtney Kardashian. The 17-year-old, who is celebrating her 18th birthday next week at a beach club in Montreal, posted a selfie to Instagram taken in her bathroom mirror.

"Kourt & Ky swim session," she captioned the shot.

A photo posted by King Kylie (@kyliejenner) on

Fans were quick to pay homage to the reality star's look. Later in the day, she shared a photo of some artwork done in her honor.

A photo posted by King Kylie (@kyliejenner) on

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