The short video shows Tyga saying: "I don't f**k with nobody. It's just me, my fiancée, this lil dog…"
Hmm… intriguing. But before we get carried away imagining what colour hair Kylie might have on her wedding day, it's interesting to note what TMZ uncovered…
Just before that Snapchat was posted, Tyga had shared a video to his Instagram showing rapper Logic giving an almost identical quote, suggesting Tyga was just repeating what he had said for fun.
That's what fans think, anyway, with a string posting online about that very video.
One user (@_a.gangsterz.wife_) said: "They're not engaged look at his page. He's just copying someone else." Another (@shelby_lr) pointed out: "Y'all CHILL haha he's copying a video that he posted on his Instagram of the guy saying the exact same thing."
Kylie, 18, actually denied engagement plans back in July, telling fans: "Not planning on getting married anytime soon!"
She's been more open about her romance with rapper Tyga, 25, in recent weeks. Tyga publicly presented her with a Ferrari on her 18th birthday in August, and they hit the FROW together at New York Fashion Week this month. Tyga also joined the Kardashians on holiday in St Barts this summer, fuelling speculation he will be featured in upcoming episodes of Keeping Up With The Kardashians.
All you need to know about Kylie Jenner: