Kylie Jenner dating Justin Bieber's BFF Lil Za? 'KUWTK' youngster cozies-up with rapper in Biebs' 'weed' kitchen, smoking marijuana now? [PHOTOS]

Uh-oh.... watch out Kris Jenner! Justin Bieber's troublemaker friend Lil Za is making the moves on youngest daughter, Kylie Jenner! 

Rumors initially suggested that the "Keeping Up with the Kardashians" beauty was actually dating the Biebs. Then, she was spotted flirting and partying with Lil Za. Now, she's moved on to Lil Twist!

FYI - the aspiring rapper was recently arrested and charged with three felonies following the "Believe" crooner's "egging attack" on his neighbor's home...

So, how is Kylie involved in all of this?

Well, she was spotted hanging out and cozying-up to Lil Za at Bieber's mansion earlier this week. There's even proof on Instagram:

lilza: "Jenerrrrrrrrr."

According to TMZ, it's obvious that the group of pals were chillin' in Bieber's kitchen - aka, the "weed den." Just check out the crazy marijuana stash Bieber keeps on a consistant basis.

Lil Za refers to Jenner as his "best friend" -

Is the Kardashian youngster simply looking for trouble by spending time (and potentially starting a relationship) with Lil Za? Wonder if any of her sisters will eventually step in?