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    Kendall Jenner Continues Birthday Celebration Wearing a Mask With Khloé Kardashian Odom for 18th Birthday Dinner!

    Kendall Jenner, Instagram Instagram

    Kendall Jenner's 18th birthday celebration didn't stop at Six Flags Magic Mountain.

    The Keeping Up With the Kardashians star continued her birthday festivities Sunday evening, ringing in her official 1-8 with a birthday dinner with family and friends.

    "Birthday dinner," Kendall wrote on Instagram Sunday night, posing in a festive mask with her pal Spencer Johnson.

    The stunning model also posted a shot of a Shirley Temple topped with dry ice, writing, "my Shirley Temple has a mind of it's own."

    PHOTOS: Kendall Jenner gets early 18th birthday present: meet her Great Dane puppy Blu!

    Kendall Jenner, Instagram Instagram

    Earlier in the day, Kendall showed off a photo of her bedroom, which a couple of friends decorated with "Happy Birthday" and "Birthday Princess" signage.

    And they weren't the only ones who went out of their way to make the birthday girl feel special.

    Kim Kardashian also paid tribute to her younger sis on her big day, posting an adorable collage on Instagram with this note: "Happy 18th Birthday to the sweetest girl I know @kendalljenner I hope your adult years are filled with happiness & so much [love]."

    PHOTOS: Kendall Jenner's best modeling pics!

    Kendall Jenner, Instagram Instagram

    Khloé Kardashian Odom, who rocked a mask with Kendall in another shot from her sister's birthday dinner, posted a collage of Kendall as well on Instagram, along with a super sweet message.

    "Happy birthday Kendall!!!!! 18 years ago my life was changed forever because of you! The joy and peace you bring to so many lives are just a few of the rare gifts your spirit possess. I couldn't be prouder of the woman you are becoming. Happy birthday to my best friend, my roommate, my puppy sister, my heart. Sisters by blood, best friends by choice," she wrote.

    Too sweet!

    Happy Birthday Kendall!

    PHOTOS: Kendall Jenner's best Instagram pics