Kim Kardashian honors nephew Mason Disick's 13th birthday with RARE snap

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Kim Kardashian didn't let the day end before wishing her firstborn nephew Mason Disick a happy 13th birthday.The mom-of-four took to Instagram Stories to upload a photo of the two standing back to back, proving that Mason had surpassed Kim's 5foot2inch frame.She wrote over the image, 'The day has come where you're taller [than] me now.' Birthday tribute: Kim Kardashian didn't let the day end before wishing her first-born nephew Mason Disick a happy 13th birthdayIn the photo the proud aunt was dressed in a gray jacquard Skims robe with black sunglasses and a black backpack on her shoulders.Mason wore a backpack as well, along with gray sweatpants and a white t-shirt as he carried a sweatshirt.

The entrepreneur was seen with the platinum blonde locks she's rocked throughout the year and the youngster sported a shaggy mushroom haircut.Kim added in the post, 'I just love who you are and I'm just so proud of you Mason.

Welcome to your teenage years. Happy Birthday.' Flashback: Kim and Mason pictured together in a throwback photoKourtney Kardashian and Scott Disick's second son Reign shares a birthday with his older brother.The boys were both born on December 13 but are five years apart, and Reign is now eight-years-old.

Their sibling, sister Penelope Scotland Disick, turned ten-years-old in July. Oh boy: Kourtney Kardashian and Scott Disick's two sons had birthdays on Wednesday.