Blac Chyna and Rob Kardashian joined his family to celebrate Khloe Kardashian's birthday on Monday.

Pregnant Blac was eager to show that she has been accepted by the sock designer's family, taking to Instagram to share a number of pictures of her with them, including one with "mama" Kris.

She captioned the image of them laughing together: "So much fun with Mama @krisjenner."

Blac, Rob and Khloe all posed together for a goofy picture in the photobooth, which Blac captioned: "Happy Birthday @khloekardashian."

And she even shared a picture of her with her former best friend Kim Kardashian West.

During the day, Khloe's family took to social media to send her birthday wishes, with Kourtney writing: "Happy birthday to my little cinnamon sugar apple pie, rainbow sprinkle covered strawberry shortcake, powdered sugar lemon meringue, chocolate mousse with whipped cream and a cherry on top. I love you madly. Happy birthday (sic)."

Kim shared a sweet throwback picture of them together and wrote: "Happy Birthday to the most beautiful soul and ass, Koko @khloekardashian You constantly surprise me with your strength and determination. I've learned so much from you in this life time, I'm so proud to call you my sister and best friend! And the best auntie to my babies! I love you okkkkkuuurrrr! (sic)."

And Kris also shared a gushing message, which read: "Happy Birthday to my beautiful Bunny @khloekardashian ...You are the most beautiful girl inside and out. You are the light of our family through thick and thin and are the strongest woman I have ever known. You are the most amazing daughter, sister, auntie, friend, and you have the biggest heart. You are so kind, selfless, and generous with everyone. You are so funny, so smart, and have incredible work ethic and a powerful drive that is contagious. I am so proud and completely blessed to have you as my daughter. I love you more than you will ever know and cherish each and every moment with you...have the best day my pretty girl!!! (sic)."