Kim Kardashian shared a loving birthday tribute to her nephew Mason Disick, with Kardashian fans left speechless at the youngster's transformation.
Mason, the eldest son of Kourtney Kardashian and her ex-boyfriend Scott Disick, turned 13 on Wednesday and his famous family flocked to social media to wish him a happy birthday.
Taking to her Instagram Stories, 42-year-old Kim shared a snap of her and Mason standing back-to-back, with the teen now visibly taller than his auntie.
"The day has come where you're taller than me now. I just love who you are and I'm just so proud of you Mason. Welcome to your teenage years. Happy birthday," Kim captioned the snap.
In the picture, Kim had opted for a casual look and wore grey and white loungewear with a pair of dark black sunglasses.
Mason wore a baggy white T-shirt and grey sweatpants, completing his look with a black backpack.
The family snap was shared on a Kardashian fan page, @kardashiansocial, with the caption: "Kim's birthday post for Mason today. He is officially taller than Kim!"
Fans were quick to comment on the photo, with many saying they almost didn't recognise the growing teen.
"Omg?? I was so confused who that was at first. Mason has grown up so fast!!! Didn’t even recognize him," one fan commented.
Another said: "Mason looks so grown up!!" A third fan added: "Happy birthday mason from Australia you have grown so much."
However, someone else pointed out that Kim isn't the tallest as they wrote: "Isn't she only 5'2."
Mason wasn't the only Kardashian celebrating a birthday on Wednesday, with his brother Reign Disick turning eight on the same day.
Kourtney, 43, shared an emotional tribute to her children as she shared a sweet throwback snap of the brothers to celebrate the special day.
She captioned the post: "December 14th… one of the best days of my life, twice and forever. my birthday boys," adding two red heart emojis.
Grandma Kris Jenner also wished the boys a happy birthday and said she is 'so very proud' of Mason and Reign.
"Happy birthday to two of the brightest lights in my life, my beautiful grandsons, Mason and Reign! Mason, you are my first-born grandson, and I am so very proud of you each and every day!
"You’ve grown into such an amazing young man, and I adore you. Reign, you are the funniest!!!! You are one special guy with so many facets to your personality!!!
"Both of you have the most amazing qualities and are kind, considerate, loving, so smart, so talented in so many ways, and such a special magical part of our family…
"AND it’s wild that you were born on the very same day!!!! Five years apart!!!! You are both the best sons, grandsons, brothers, nephews, and friends to all of us and I love you so much!!!!!!!"
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