The Kylie Jenner and Blac Chyna Instagram feud just got more serious as Tyga's baby mama posted photos on her social media while completely topless. She also declared that she's ready for "round two."

The whole feud reportedly started when Blac Chyna posted a blinged Audemars Piguet watch gifted to her by Tyga when they were still a couple. A little later, Kylie Jenner posted a similar watch along with the caption, "currently."

"Kylie Jenner might only be 17, but her trash talking game is fully grown ... after she not-so-subtly taunted her mortal enemy Blac Chyna," said TMZ.

A source told Radar Online, "Kylie was definitely throwing shade at Blac Chyna. She thinks that Blac Chyna is a tasteless and classless excuse for a celebrity and she is not going to back down to her because she is the mother of Tyga's son."

But Blac Chyna is not about to be schooled by a 17-year-old kid so she posted almost nude photos of her on social media, flaunting all her assets.

"Just hours after the apparent watch-related dig, the 26-year-old former fiancee of Tyga shared four eye-catching pictures of herself in a living room, pulling out a series of poses while wearing nothing but a pair of sparkly red hotpants and heels," Daily Mail said.

"She also put up a picture of a woman crying with a quote over the top, which read: 'When you almost died during round one and he ask if you ready for round two," it added.

However, Radar Online noted that Kylie Jenner appeared to be taking the high road posting a positive message that reads, "When God wants you to grow, he makes you uncomfortable," instead of fueling the Blac Chyna feud. "Kylie posted that to show that she does not give a cr*p. She also wanted to show that, even though Tyga may be the father of Blac Chyna's son, he will never be her man again," the source said.