Mason Kardashian, Kourtney Kardashian’s son, is now a teenager — and appears to be taller than his reality star aunt Kim Kardashian.
The KKW Beauty founder confirmed the 13-year-height old’s on her Instagram Stories on Wednesday.
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“The day has come where you’re taller than me now,” Kim, 42, wrote to her nephew.
“I just love who you are and I’m just so proud of you Mason,” the “Kardashians” star continued. “Welcome to your teenage years. Happy birthday.”
Kim stood back-to-back with the teen in the social media upload. Kourtney, for her part, paid tribute to Mason and his brother, Reign, 8, in a separate post because the siblings share the same birthday.
“December 14th … one of the best days of my life, twice and forever,” the Poosh creator, 43, captioned a throwback snap. “my birthday boys 
.”
Kourtney, who also has a 10-year-old daughter Penelope, welcomed Mason and Reign in 2009 and 2014, respectively, with her then-boyfriend Scott Disick.
Disick, 39, honored his little ones with Instagram Story tributes Wednesday, too.
“Happy birthday 2 my better half,” the Talentless creator wrote. “Love you Mason. Nobu Nobu Nobu.”
In a second slide, the “Flip It Like Disick” alum added, “I think it’s safe to say Rayman liked his birthday gift. Love you son!!! You make my life a better place.”
Disick and Kourtney divorced in 2015, and the Lemme creator is now married to Travis Barker of Blink-182 and trying to conceive a child.
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While the Hulu personality was undergoing IVF, she told the Wall Street Journal in September that she had decided to discontinue her treatment.
“It was a lot. I took a break to just focus on our wedding and getting married,” she explained.
