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    Kylie Jenner Sends Sweet Note to "Best Friend" Jaden Smith on His Birthday

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    Kylie Jenner, Jaden Smith Instagram Instagram

    Jaden Smith is growing up right in front of our eyes.

    Will and Jada Pinkett Smith's son is celebrating his 15th birthday today, and among the tweets he's received from his numerous fans and friends, one special shout-out was given to him by his BFF Kylie Jenner.

    "Although we can't remember exactly when we met, I couldn't be more grateful that we did," the E! star wrote along with a candid shot of the pair.

    "You understand me like not many do & you always know the right time to make me laugh. And no, you haven't failed once to catch me when I attempt to walk or open the door on my every entrance. Happy birthday to my best friend."

    PHOTOS: Kylie and Jaden hang out together for the Fourth of July

    How presh, right?!

    Kylie's sister Kendall and mom Kris Jenner also joined on giving Jaden some special birthday wishes on the Internet.

    "Happy Birthday @iputthesocietyonmyback I love you Jaden!! Have the BEST day ever!! #bestkidever," Kris wrote, while Kendall said, "happy birthday to one of the sweetest kids I know! have a good one mr! @officialjaden."

    And of course, Justin Bieber gave his pal a birthday tweet, saying, "everyone wish Happy Birthday to my brother for life @officialjaden!!!

    LOOK: Kylie Jenner rocks a tiny black bikini

    In March, rumors began swirling that Kylie and Jaden were an item after being spotted out together numerous times, however the young celebs each spoke out against the claims and reassured fans that they're just really good friends.

    "She's one of my best friends. It's pretty awesome," Smith told Britain's Wonderland magazine.

    Meanwhile, Jenner explained to E! News that her friendship with Jaden is "refreshing," adding that, "Some people don't understand and some people do. And it's just great to have someone grow up in the same position as you and you can relate in that kind of way, so it's fun."

    PHOTO: Kendall goes makeup-free for magazine shoot

    Jaden Smith, Kendall Jenner Michael Simon/

    Before the Kylie romance rumors began, fans wondered whether or not Jaden was dating her sister Kendall, after a photo of the twosome holding hands while ice skating at her birthday party surfaced, but the 17-year-old was quick to put those to rest.

    "He is like my little brother," she told E! News. "So funny. Never knew people talked about that."

    Just so we're all on the same page here, the teen is not dating Kylie or Kendall...or anyone for that matter, because Smith decided to take his famous dad's advice.

    "Probably the best advice he's ever given me is, 'Don't have a girlfriend,'" Jaden revealed. "The stress is real."

    VIDEO: Kylie wants space from Kendall

    The Men in Black actor clarified, "At this point, I just want him to establish his dreams, establish his desires. Find out who he is. And blending with another person is very difficult, and a lot of times you can lose yourself in that process. So my encouragement to him is to be honest with anybody that he interacts with. Don't make commitments that a 14-year-old can't live up to."

    What about a 15-year-old, Will?

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    Be sure to watch Keeping Up With the Kardashians, Sundays at 9 p.m., only on E!

    PHOTOS: Keeping Up with Kendall & Kylie on Instagram!