Kylie Jenner posted a very special Happy Birthday message to her "best friend," Jaden Smith on Monday.

The "Keeping Up with the Kardashians" star, 15, took to her Celebuzz blog for a sweet public display of affection to celebrate rumored beau's 15th birthday, which also happened to be the day of her niece, Penelope Scotland Disick's 1st birthday. She must have been so happy that she re-posted the message on Instagram and Facebook. 

She wrote, "Although we can't remember exactly when we met, I couldn't be more grateful that we did. You understand me like not many do & and 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." The teenage model, who spent her Fourth of July with Smith and her family at a Malibu beachhouse, admitted that Smith is her best friend in the post.

Jenner had double the birthday celebration with two of the closest people in her life born on the same day. She posted a black-and-white photo of her and Smith, looking shyly, but happily away from him. Their body language speaks volumes, reported the Huffignton Post. 

And though the twosome share a special connection, neither has denied or confirmed a budding romance. Recently, Jenner did take to Twitter to address the media about rumors on her dating life.

She tweeted, "Media always makes it seem like I'm dating everyone I'm seen with...Makes no sense to me. Don't listen to everything u see, people."

Cameras caught the raven-haired reality TV star holding hands with Jenner at the movies in Calabasas, Calif. recently, igniting more rumors that they were an official couple and had gone public. But again, no word from either star responding to the relationship speculation. Despite the rumors, Jenner expressed her love for Smith, who is also a favorite among her family.

Both Kris and Kendall Jenner tweeted Happy Birthday messages to the "After Earth" star as well on Monday.