Kylie Jenner Not Wearing a Seat Belt ... Or a Bra!!

4/29/2017 2:27 PM PDT

Kylie Jenner Posts Underboob Photo from the Car on Instagram (PHOTO)

Now we know how Kylie Jenner likes to ride on the weekends ... free and easy.

Kylie posted an eye-popping underboob pic from her car on Saturday, showing her wardrobe choice for the day is a loose hoodie, tube top ... and definitely no bra.

Hopefully she buckled up before she took off -- that looks dangerous.