Kim Kardashian's Birthday Message For Kourtney Kardashian Is Unbeatable — PHOTO

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It's a Kardashian's 38th birthday and her family is sending her some sweet messages — as always. But, there is one sister who's message can't be beat. Kim Kardashian wished Kourtney Kardashian a happy birthday on Instagram with the perfect throwback photo and some truly hilarious words. Alongside it, she wrote, "Happy Birthday to the one and only gluten, dairy, wheat free human @kourtneykardash My best friend, the best mom and the best sister in the world!" How perfect is that?

I can't help but applaud Kim for including her eldest sister's eating habits into a birthday caption. It's actually really funny. Kudos to you Kimberly. You truly have your shining star moments and this is certainly one of them.

For those who consider themselves Kardashian aficionados, then you're well aware that Kourtney lives a gluten and dairy-free lifestyle. She also makes sure her kids, Mason, Penelope, and Reign Disick are eating healthy right alongside her. That's not to say her kiddos don't partake in junk food every now and again. As she revealed on her official website last September, "Of course, we pick our battles and I do let the kids have popcorn at the movies and a churro at Disneyland, etc."

Now, who knows if Kourtney herself will eat a gluten, dairy, and wheat-filled dessert. Seeing as it is her one special day of the year, she just might splurge. But, what really matters here is how Kim was able to poke fun and say happy birthday all at once in one simple message for her sis.

Kim also took to Twitter, where she shared some sweeter messages for Kourtney. Alongside the same image above, the Keeping Up With the Kardashians star wrote, "Happy Birthday to the one and only @kourtneykardash My best friend, the best mom and the best sister in the world!" Kim even shared a super cute video featuring old footage of herself and Kourtney as kids. Yes, back then, they were even stars, with Kim sometimes stealing the spotlight. It's only a snippet, but if you want to watch the whole thing, you can check it out on Kim's app.

Kourtney's other family members have also taken to social media to wish her a happy birthday with videos and collages, but Kim's can't be beat.