Kris Jenner, 57, shared a photo of herself in a bikini just days after Kendall Jenner posed for swimwear line Agua Bendita Credit: Courtesy Kris Jenner

Looks like Kendall Jenner has some competition -- from her own mother! Days after the aspiring model, 17, wowed in stunning new shots for Agua Bendita's swimwear line, mom Kris Jenner shared a bikini photo of her own on Instagram.

The 57-year-old Keeping Up With the Kardashians matriarch posted a picture of herself waist-deep in a pool on Sunday, Sept. 15. In it, she wears nothing but a cleavage-baring blue bikini and a chunky gold necklace. Her short dark hair is slicked back, and her face is fully made up with black eyeliner and bright pink lip gloss.

"Last day of summer gonna miss you," Kris captioned the snap.

The post came shortly after daughter Kendall shared another sexy sneak peek of her new ad campaign for Colombian clothing company Agua Bendita. She joined Victoria's Secret Angel Candice Swanepoel as one of the faces of the brand earlier this year.

"I don’t think some people take me very seriously," Kim, Kourtney, and Khloe Kardashian's younger half-sister told V magazine of her modeling career recently. "When I started off, I was way more of a personality in modeling and it wasn't like, what I wanted to be exactly."

She added: "I want to be more high fashion; I want to be more editorial, but hopefully I'll just prove myself."