Kylie Jenner drove around Beverly Hills on Sunday in her newly gray Ferrari, a birthday present from boyfriend Tyga

By Lindsay Kimble
August 24, 2015 11:15 AM

It has been barely two weeks since Tyga gave Kylie Jenner a lavish new white Ferrari for her 18th birthday, but she’s already given the luxury car a complete makeover.

Kylie hit Beverly Hills with pal and “Do It Again” singer Pia Mia Perez on Sunday, doing some retail therapy and debuting the new matte gray color of her ride.

The $320,000 Ferrari 482 Italia also has new red wheel rims in place of the original black and gray ones.

The teenager, who just returned from her family’s St. Barts vacation, looked sporty in Under Armour leggings, Nike sneakers, a crop top and a leather baseball cap. She and Perez, 18, left Barneys New York carrying small shopping bags.

Kylie Jenner and Pia Mia Perez

Watch: Austin Mahone Takes Us Inside Kylie Jenner’s 18th Birthday Party

Sister Kendall Jenner had her own fun in the city on Sunday, grabbing lunch and frozen yogurt with friends.

The 19-year-old went with a more subdued look than her little sister, wearing a striped, long-sleeve crop top and ripped denim as she indulged her sweet tooth.

Kendall Jenner

Kendall and Kylie kept active last week while vacationing, even trying out FlyDiving with Tyga on the Caribbean island.