Kourtney Kardashian Shares Racy Photo in Barely-There Bikini Bottoms: 'Sunday Funday!'

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More like Sunday “Bun”-Day! Kourtney Kardashian left little to the imagination over the weekend when she posted a sexy shot of her racy bikini bottoms to Instagram.

“Sunday funday!” she captioned the photo that was cropped to show her toned tummy and voluptuous booty in black, string bikini bottoms.

MORE: Rob Kardashian Celebrates His 29th Birthday With His Famous Family

The mother of three, 36, is currently enjoying her single life, despite spending plenty of time with her ex Scott Disick. The exes gathered on Saturday to celebrate Rob Kardashian’s birthday with the rest of Kourtney’s famous family.

The crew, including Kim Kardashian, Kanye West, Kris Jenner, North West, Kendall Jenner, Kylie Jenner, and Penelope Disick, posed for a group photo.

“Fams,” Kourtney captioned one shot.

RELATED: Kourtney Kardashian and Scott Disick Take Their Kids to Harry Potter World

The day before the birthday bash, Disick and his former love took their kids on a family outing to Universal Studios’ Wizarding World of Harry Potter.

“A little Harry Potter magic,” Kourtney captioned a pic of Penelope using her wand at the theme park.