Kim Kardashian is celebrating her daughter North West's fourth birthday.

The 36-year-old "Keeping Up with the Kardashians" star dedicated a sweet message to North, her "mini me" daughter with husband Kanye West, on the toddler's birthday on Thursday.

"Happy birthday to my mini me! I can't believe you are 4 already. I love you so much, Northie!" she wrote on her website.

Kardashian's mom, Kris Jenner, and sister Kylie Jenner were among those to also wish North a happy birthday online.

"Happy birthday to our beautiful, funny, smart little love bug, North," Kris wrote on Instagram.

"You bring so much light to our lives and I am blessed beyond words to have you as my granddaughter. It brings me so much joy to watch you grow up to be sweet and kind and loving... I love you so much my precious angel girl."

"Happy birthday to this cutie," Kylie added on her own account.

Kris is also grandmother to Kardashian's son, Saint; Kourtney Kardashian's children, Mason, Penelope and Reign and Rob Kardashian's daughter, Dream.

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She recently confessed she fears her grandchildren will be bullied because of her family's fame.

"It's my grandchildren who I worry about because I have six of them; the oldest just turned 7, and my youngest is 6 months old, and they don't have a choice about [celebrity]," the star told The Hollywood Reporter. "And I worry, I do, because it is such a bullying environment."

Kardashian and her family came to fame on the E! series "Keeping Up With the Kardashians," which completed a 13th season this week.

Her sister Khloe Kardashian said on Sunday's episode that her boyfriend, Tristan Thompson, wants "five or six" kids with her.