Kylie, 18, announced she and her 20-year-old sister will release a Kendall + Kylie swimwear collection for Topshop in a series of posts Wednesday on Instagram.
"Shooting Kendall&Kylie swim for TopShop. Coming soooon," she captioned a photo of herself on location for the ad campaign.
Kylie modeled several suits, including a neon yellow bikini and a neon orange one-piece with a zippered front. Kendall wasn't seen on set and didn't share any photos from the shoot.
Kendall and Kylie launched their first clothing line for Topshop in June, which featured "a simple and vintage-inspired way to do LA style." The sisters kept their California lifestyle in mind when designing the collection.
"We were thinking about the LA girl, who she is, what she loves to do and what her dream capsule wardrobe would be," Kendall told Topshop in an interview. "There are lots of lighter shades and florals that give that sunshine feel."
Kendall and Kylie previously collaborated on a clothing line for PacSun and shoes and handbags for Steve Madden. Kendall also keeps busy with her modeling career, while Kylie has released her own hair extensions and lip kit lines.
"I just really want to be a businesswoman," Kylie said in the December issue of Interview. "If I could do whatever I wanted, I would have a successful makeup line, and I would want to hopefully start more businesses ... And then, hopefully, I'll go off the map."
Kendall and Kylie will return on their family's E! series, Keeping Up with the Kardashians, on May 1.