KIM, Khloe and Kourtney Kardashian look unrecognizable in a "good throwback" photos.
The famous family have shared a number of old snaps to celebrate Kourtney's 42nd birthday on Sunday.
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Kim, 40, took to her Instagram Story to share an old photo in honor of her older sister's birthday.
In the photo, Kim, Kourtney, Khloe and their mother Kris Jenner smiled for the camera as they appeared to be on a beach.
Alongside the photo, the Keeping Up With the Kardashians star wrote: "Happy Birthday @KourtneyKardashian!!!
"I love finding some good throwbacks of us.
"I couldn't be more thankful for our memories together."
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Kim concluded: "Love you so much and can't wait to celebrate your birthday!"
The mother-of-four continued to share more throwback photos with the birthday girl, which included the pair posing for a selfie, the sisters all dressed up for an event and posing with some of Kim's children.
More throwback snaps showed the sisters as little girls, while one photo showed Kim, Kourtney and Khloe wearing bathing suits with voluminous hair.
Even more photos of Kim and Kourtney followed, which showed the sisters lounging in black bikinis on the beach and enjoying ice cream at a restaurant.
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Kim isn't the only sister to wish Kourtney a happy birthday, as Khloe and Kendall Jenner have also shared throwback photos to celebrate Kourtney's day.
The family's matriarch, Kris, also celebrated her first born's birthday with a series of throwback photos on Instagram.
Kourtney began the birthday celebrations with her boyfriend Travis Barker on Saturday.
The Keeping Up With The Kardashian star showed off the lavish floral arrangement she received from Travis on her Instagram Story, before the couple headed out on a romantic dinner.
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The mother-of-three shared a video of the incredible arrangement, which consisted of white tulips displayed on the floor of her home and a hanging installation of gardenias.
Alongside the clip, she penned: "Tulips and gardenias are my favorite flowers.
"My entire house smells yummy."
Later on in the evening, the couple enjoyed a romantic night out at a swanky restaurant.
Travis documented the outing on his profile as he showed off a personalized birthday dessert for his girlfriend.
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Kourtney also spent time with her famous sisters earlier this week.
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Alongside photos of the famous family posing on a couch, Kim wrote: "4 EVA EVA."
The birthday girl also shared a pic of the sisters - with most of them throwing the middle finger - and captioned the photo: "Where's Rob?"
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