Kylie Jenner Drops Some Serious Cash On Another New Crib

Kylie Jenner is becoming quite the real estate aficionado ... because she just threw down millions on yet ANOTHER new mansion.

The $12 million, 13k square foot house in Hidden Hills comes equipped with 8 bedrooms, 11 bathrooms and a gigantic pool and outdoor living space.

Kylie's been swooping up properties left and right in the last year ... the latest purchase is her fourth. Our sources say the 19-year-old -- yes, 19 -- has already moved in and plans on making this one her permanent residence.

You'll remember ... Kylie's starter home was a modest $2.7 mil crib when she bought when she was 17. Then she moved on to a $6 mil place near Kim and Kanye before plunking down $4.5 mil on a home used for guests and as a work space for her cosmetics line.

We reached out to Kylie's agent Tomer Fridman who wasn't available for comment.