Just over two months after they started hooking up, Rob Kardashian and Blac Chyna are engaged.

Chyna announced the news early Tuesday morning on Instagram. She holds Kardashian's chin with one hand and flaunts a sizeable ring with the other. "YES !..!..!" she wrote in the caption.

Their romantic involvement began in January, with no apparent qualms about the fact that Kardashian's half-sister Kylie Jenner is dating Tyga, father of Blac Chyna's child. 

Congrats to the happy couple. The next question: when's the wedding? And while Kardashian make Blac sign a pre-nup?