Don’t think for a second Kim Kardashian is stressin’ over failing the bar exam … because judging from her Instagram, she’s living her best life.

The reality star posted a series of bikini shots Sunday … coolin’ out at a beautiful, sun-drenched resort in black two-piece — shortly after celebrating her sister Kendall’s 30th birthday. In one of the pics, you can see balloons wishing Kendall a happy birthday.

Kim uploaded the series of sexy pics following another birthday bash — her mom Kris’ 70th — held Saturday night at Jeff Bezos’ L.A. compound.

Kris’ party was loaded with some of the biggest names in Hollywood … including Oprah Winfrey, Jay-Z, Beyoncé, Prince Harry, Meghan Markle, Hailey Bieber and Mariah Carey.

As for the bar exam … Kim revealed she failed it Saturday before heading over to Kris’ big night.

She joked she’s not a lawyer yet but plays one on TV, referring to her divorce-attorney role in the legal drama, “All’s Fair.”