▲The eldest Kardashian sister mixed pinstripes into her athleisure ensemble, adding a unique look to her simple crew neck sweater and matching bicycle shorts.

▲The former Miss Universe donned aviator spectacles and a cropped black cotton top, along with jogger sweats and black lace-up boots.

▲The model and socialite rocked up to New York Fashion Week in a white tracksuit and heels.

▲The actress wore a burgundy, velour track suit paired with tinted sunglasses for a very laid-back but trendy look.

▲Walking with her son, the actress chose a sleek black athletic ensemble, topped off with a vest and big shades.

▲The 'Real Housewives of Beverly Hills' star knows how to add a sense of maturity to her athleisure look, bundled up in a black and gray ensemble.

▲The model raises the bar for airport style in her simple white midriff tee, tan track pants, and Louis Vuitton handbag.

▲The actress topped off her casual athletic outfit with a pair of Givenchy sport sandals, so you know it's still high fashion.

▲With Kanye West for a husband, it was no surprise Kim K was spotted in Yeezy athleisure wear all the time. She's somehow managed to pair sweatpants with heels and make it look chic.

▲Kourtney does it again in a white Adidas midriff tee with black lace trim, white jogger sweats, and black heels.

▲Khloé met up with her big sister Kim, who similarly wore calf-length leggings and clear heels, but paired it with a sports bra and a bomber jacket.

▲This Kardashian loves to stay comfy, and she wore an all-white sweatsuit to grab lunch with her sisters.

▲What’s red and black with swooshes all over? A coordinated athleisure outfit!

▲Mrs. Bieber had a bold take on the athleisure look, with a red Adidas coat, bodysuit, track pants, and black stiletto boot heels. Lipstick and athletics!

▲The singer wore a flame-print sweatsuit and white Nike high-tops to run errands.

▲The model looked sleek in a stretchy black ensemble as she was spotted leaving a skin clinic.

▲The youngest Kardashian sister hopped on the athleisure train and paired calf-length leggings with a tied-up black blouse and clear heels.

▲The pair stepped out in matching leggings, aviators, and bomber jackets. Do you think it was planned?

▲The world-famous supermodel brought an added level of class to her striped black track pants and high-tops with her elegant white coat.

▲The "are they, are they not" couple looked like the perfect balance between stylish and relaxed, as if they don't care what you think while simultaneously knowing that you think they look cool.

▲The pop singer was spotted in an Oakland Raiders jacket, gray sweats, and socks and sandals, while his wife wore a hoodie and leather pants. They go to a very special church where athleisure is the new “Sunday best.”

▲Scott Disick has a signature brand of comfy which he maintained at New York Fashion Week.

▲The singer stepped out in New York City looking like a dad running Saturday errands, but still somehow very cool.

▲The young model hopped on the bicycle shorts trend and completed the look with a headband, black sneakers, a light blue sweater, and a Louis Vuitton bag.

▲The 'Game of Thrones' actress wore a red long-sleeved top over black bike shorts and white Nike trainers next to her similarly casually dressed hubby, Joe Jonas.

▲Selena Gomez was spotted getting her iced coffee fix dressed in a Versace sweatshirt, gray sweats, white trainers, and carrying a Coach bag. Casual was never so expensive!

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The model stepped out with her family in a black baseball cap, black sports bra, leggings, a leather jacket, and black trainers.