Kylie Jenner JUST got a $320K Ferrari from boyfriend Tyga for her 18th birthday, and she's already repainted the thing!

On Sunday, Kylie and pal Pia Mia went for a joyride in the pricey whip and then headed to Barneys New York in Beverly Hills for some retail therapy. Prior to that Kylie stopped by a studio in Los Angeles to say hi to big sis Kendall, who admired the ride but didn't get in. Hey, with Kylie behind the wheel, can't say we blame her! We think it's only a matter of time before this starlet crashes the car...