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Kylie Jenner

AKM-GSI

Kylie Jenner has swapped out her sky-high heels and skin-tight dresses for a different type of body-baring outfit: athletic wear.

The 18-year-old was spotted on a shopping trip with her boyfriend Tyga, 25, in Los Angeles on Thursday, wearing a black Puma sports bra with a pair of patterned Puma leggings. The ensemble showed off her famous curves—like her toned tummy and pert derriere (which she swears is the result of some booty plumping cream).

But sportswear aside, Kylie made sure to top off her look with at least one piece of expensive, designer fashion: her Hemés Birkin bag she got as a gift on her 18th birthday.

Kylie Jenner, Tyga

FM/FAMEFLYNET PICTURES

Tyga also went for a casual look, donning striped tee with a baseball cap and accessorizing with a chain—after all, he is known as "King Gold Chains."

The couple has been more open about their relationship lately. Following her birthday party—during which the rapper presented her with a brand new Ferrari—they've vacationed in Mexico together, kissed in Tyga's new music video and started posting more photos of each other on their social media platforms. The two have even started taking late-night Snapchat videos together.

Just last week, Kylie shared a series of videos as she got ready for bed with her rapper beau. She did a little face mask as Tyga watched with wonder, admitting he felt "FOMO" (fear of missing out) while she underwent the mini beauty treatment.

The evening before that, they gave fans some insight into their couple-y date nights as they cuddled up in Kylie's home theater, snacked on Cheetos and watermelon and played with her two dogs.

It seems the duo—who started dating in October 2014—are almost inseparable at this point!