Model Blac Chyna, 26, dissed Kylie Jenner, the youngest member of the Kardashian-Jenner family, on Instagram late Tuesday, posting a photo of herself with fake wax lips. Though she didn’t include a caption with the photo, fans assumed it was taken in response to the Kylie Jenner Lip Challenge, an online trend where participants placed a glass or plastic cup around their lips and sucked on it for five minutes, resulting in a swollen, but bruised pucker.

Blac Chyna posted a second photo of the product she used – Wack-o-wax lips.

The 26 year-old’s photo began trending on Twitter, and her fans and followers responded by posting photos of Jenner before she allegedly improved her pout.

Blac Chyna is a former friend of Jenner’s older sister, Kim Kardashian, but confirmed the friendship was over in March.

In a video posted on TMZ, Blac Chyna was asked if she was still friends with Kardashian.

“You know what I mean, we, we…” she responded.

Jenner hasn’t responded to the insult, but she did respond to the challenge on Twitter on Tuesday. Plastic surgeons don’t recommend sucking on a plastic or glass cup to enhance lips.