Kylie Jenner and Jaden Smith have never publicly confirmed their relationship, despite the fact that these "best friends" have been caught holding hands. But even if their relationship isn't public, we're wondering if one of Kylie's latest Instagram photos hints that their relationship is getting serious — maybe even marriage-serious.

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While Kylie has snapped photos of herself wearing rings before, this one looks less like a stylish accessory and more like an engagement ring or a promise ring. Plus, it's on the engagement ring finger. As if that wasn't enough, Kylie later posted a photo of the two of them together, wishing Jaden a happy birthday.

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Even if Jaden actually popped the question, they probably wouldn't admit to it. Again, they still insist that they're only best friends! And since they're both only 16, we're not expecting wedding bells for Jaden and Kylie any time soon. But we are curious who gave her that ring. It looks pretty special.

Do you think Jaden and Kylie make a cute couple? Do you think he proposed? Let us know in the comments!

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