Penelope Disick Turns 4! Read Kourtney Kardashian's Sweet Birthday Message to Her 'Little Mermaid'

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Penelope Disick is celebrating her fourth birthday in style with mom Kourtney Kardashian in the Bahamas.

Kourtney and Scott Disick's only daughter turned 4 on Friday, and the 37-year-old reality star took to Instagram to show her adorable middle child some love.

"Happy birthday to my little mermaid!" Kourtney captioned a cute pic of Penelope in a star bikini top and a bright orange sequin skirt. "Seeing the magic in the world through your eyes makes me so happy."

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Happy birthday to my little mermaid! Seeing the magic in the world through your eyes makes me so happy.

A post shared by Kourtney Kardashian (@kourtneykardash) on

WATCH: Penelope Disick Out-Slays Grandma Kris Jenner in Matching Lemon Dresses

"On mommy's lap," Kourtney captioned another sweet snap of the two in their swimwear relaxing on a yacht.

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On mommy's lap.

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Of course, Penelope also celebrated with a delicious slice of chocolate cake, which Kourtney shared on her Snapchat.

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🎉🎉🎉🎉

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Kourtney's mom, Kris Jenner, also took some time out on Friday to wish her granddaughter a happy birthday.

"Happy birthday to our little princess, my sweet angel girl Penelope!!!!" Kris wrote on Instagram. "You bring so much joy to our lives and I love you more than words could ever say!! #sweetgirl #happybirthdaypenelope #myheart."

Kourtney is currently enjoying a getaway in the Bahamas with her closest girlfriends, Isabela Rangel Grutman and Larsa Pippen, where she's been showing off her killer bikini bod. The relaxing getaway comes after she spent the Fourth of July weekend in Miami with her three kids -- Penelope, 6-year-old Mason, and 1-year-old Reign -- and also partying with her one-time rumored fling, Justin Bieber.

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On an adventure.

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On a boat.

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WATCH: Justin Bieber Spent Fourth of July Weekend Partying With Kourtney Kardashian, Dancing to Rihanna and Wakeboarding in His Underwear

Last month, the Kardashian clan celebrated both Penelope and her cousin North West's third birthday with a joint mermaid-themed party. Check out their adorable matching mermaid costumes in the video below!