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Kim Kardashian turned 31 years old today, and the newly married reality star enjoyed spending her special day with her sister Kourtney and adorable nephew Mason.

The birthday girl and Kourt's little cutie both sported shades while facing a crowd of photographers. Of course, this was all for the filming of their reality show in New York. Check out Mason's pink shades!

Kris Jenner Tweeted the following special message in honor of her daughter's birthday:

    "WOW, sometimes I still can’t believe you are all grown up and not my little girl with the ponytails and the fabulous and adorable personality who always wanted a Halloween party for her birthday!!"

Aww ... what a sweet message from mom! Kris Humphries' wifey is expected to celebrate her birthday this weekend at Marquee nightclub in Las Vegas.

Let's hope Kim and her basketball hubby get some alone time in Sin City!