Jenny from the Block has something new up her sleeve.

Jennifer Lopez has an extensive resume that spans decades as a singer and actress, but now, at age 49, she can add athleisure designer to the list. Page Six reported that J.Lo is working on a line of leggings with activewear brand Niyama Sol, creating pants and matching sports bras inspired by her music.

Known for her full figure, Lopez, who has designed clothing lines in the past, used the hashtag #whentheleggingsmakehtebootylookgood in a photo of herself wearing Niyama Sol’s workout pants. The Jennifer Lopez x Niyama Sol collection includes her ‘This Is Me Legging’ design featuring handwritten lyrics from her 2002 album, while with her ‘Amor Amor’ Miami-inspired leggings boast neon images from her family vacations and handwritten notes in Spanish. Both retail for $88. Some of her styles, which won’t even ship until the first week of September, have already sold out.

This isn’t the first time the superstar has seen success in an industry other than performing. A year after launching her Glow By J.Lo fragrance in 2003, Lopez sold $175 million in products in the United States, and as of 2016, the singer had released 26 fragrances. Since her first foray into the fashion world in 1998 when she launched the clothing line J.Lo by Jennifer Lopez, she’s launched Jennifer Lopez Collection through Kohl’s and The J.Lo Girls Collection — and MarketWatch reports that shares of Guess Inc. soared 57.3% in one month after J.Lo became a spokeswoman for the brand.

Lopez is entering one of the fastest growing categories in the apparel industry. According to market research company NPD Group, sales of both men’s and women’s activewear grew in 2017, with women’s wear reaching $21.9 billion in sales, up 4% from 2016. Not only that, according to data from the US Census Bureau, U.S. imports of women’s elastic knit pants exceeded those of blue jeans in 2017 for the first time, with 200 million pairs imported.

Celebrity stylist and style expert Elle Strauss told Moneyish there’s an obvious connection between celebrities and athleisure, “When the majority of celebrities aren’t on the red carpet, they are hanging out in trailers on film or television sets or working out preparing for roles, so athleisure speaks to them and their lifestyle.” Additionally, Strauss said celebrity collaborations are mutually beneficial and provide positive free promotion. “I think Gwyneth was the pioneer for the wellness sector so that’s also a new celebrity goal,” said Strauss. That likely explains why J. Lo isn’t the only star to dabble in the legging business.

These five celebs have also designed activewear:

Kate Hudson, Fabletics
In 2013, the actress co-founded Fabletics, an athletic apparel brand that has surpassed $300 million in annual revenue according to CNBC. The five year-old company plans to open 75 new retail stores globally and enlists celebs like Demi Lovato to be brand ambassadors. VIP Fabletics members have access to complete outfits every month for $49.95, whereas leggings for non-members retail on the site for approximately $54.95.

Rihanna, Fenty x Puma
As the creative director for the FENTY PUMA by Rihanna collection, the singer has been designing spandex styles since 2016. From leggings and tops to shoes and hats, the line ranges in price from $14.99 for unisex ankle straps sold as fashion accessories to $650 for women’s ankle boot heels. FENTY women’s ruched leggings retail for $160.

Carrie Underwood, CALIA
The country music star teamed up with Dick’s Sporting Goods in 2015 to create a line of competitively priced fitness lifestyle apparel. The line, called Calia by Carrie Underwood, features tops, bottoms, jackets, bras, swimwear, accessories and plus sizes, with leggings costing an average of $65.

Beyonce, Ivy Park
The singer didn’t just design an athleisure collaboration, she actually started an entire company that merges fashion design with technical innovation. Her Ivy Park pieces range in price from $25 to $234 and are sold at Topshop and Nordstrom.

Brooke Burke-Charvet, Caelum

Inspired by her own active lifestyle, the TV host started a line of sports bras and leggings in 2013 with her brother in law Danny Guez. The brand, Caelum, derived from the acronym core, active, evolve, live, uplift and motivate, features leggings between $60 and $128 and 17 styles of tops from $50 to $64.