Wearing a white two-piece, the mother-of-two showed off her impressive post-baby body and serious under-cleavage, thanks to some strategically placed cut-outs, which you can compare in the video below!
However, Kylie fans will say that Chyna, 29, is copying the 19-year-old lip kit mogul — who wasn't afraid to show off her seemingly enhanced underboob on social media in a series of racy shots way before Rob Kardashian's ex.
However, let's not forget who really started the trend: Kourtney Kardashian!
Unfortunately, followers really weren't feeling the look. "Summer of 2017 is gonna be nothing but Underboob and RompHims," one person commented on Twitter, while another added, "This underboob trend. Don't let the wind blow."
To test your Blac Chyna vs. Kylie knowledge, check out the gallery below!