The rapper, 26, who is dating Kardashians younger sister Kylie Jenner, commented on Chynas Instagram photo, which showed an emoji of the model pregnant.

"Congratulations," he simply wrote, adding a carp streamer emoji.

ALSO READ: Model is pregnant with Rob Kardashian's baby

This will be the first child for Rob Kardashian, 29, but Blac Chyna's second; as she and Tyga had a son together three years ago, whom they christened King Cairo.

This is the second time rapper Tyga would be extending an olive branch to Chyna. The first being when he congratulated her and Rob Kardashian after their engagement was engaged after just two months of dating.

"Everybody deserves 2 be happy. What some1 does for their happiness is not my concern, as long as it's not interfering wit my happiness," he tweeted. "It makes me happy to see the mother of my son happy. My only concern in this situation is my son. I want him in happy environments. He's innocent in this. & I want him to feel as much love as possible."