The pair, parents to baby boy King Cairo, split last year (14) after three years together and the Rack City hitmaker was subsequently linked to Kim Kardashian's teenage half-sister, Kylie Jenner.
On Thursday (23Apr15), Chyna took aim at the rumoured new couple on Instagram.com by sharing screen grabs of messages she claims to have received from her ex, in which he claimed, "I want to be with u (sic)" and "be a family again".
Tyga, real name Michael Ray Nguyen-Stevenson, has since alluded to the exposed texts with a series of tweets online, seemingly directed at Chyna.
One post, written on Friday (24Apr15), reads, "Give it up, get over it. Live your (life)", while in another, he adds, "Focus on what's real in life. Surround yourself with people that you really care about. It's simple."
Meanwhile, the hip-hop star, 25, has expressed his love for Jenner in the form of a new piece of skin art. The heavily-tattooed rapper has been photographed with the name of the 17 year old inked in large black letters on the inside of his right elbow.