Kourtney Kardashian paid tribute to sister Kim Kardashian on her 45th birthday.

Taking to Instagram on Tuesday, October 21, to share a carousel of throwback photos that captured Kim through the years, Kourtney, 46, captioned the post, “Best friends forever.”

The older sister kicked off her carousel with a stunning black and white snap of the pair posing back-to-back with matching bobs before launching into a hilarious photo of the duo sporting cosmetics to make them appear old and wrinkled.

Other throwbacks included the sisters’ momager Kris Jenner carrying baby Kourtney and Kim on each of her hips, the duo dressed in monochromatic figure-hugging ensembles, the sisters pouting in bikinis while enjoying a swim, dancing in full glam at night on a beach and partying together in a club.

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