Tyga Reacts to Ex Blac Chyna and Rob Kardashian's Baby News, Kim Kardashian and Kylie Jenner Also Weigh In!

The 26-year-old rapper -- who has a three-year-old son, King, with Chyna -- took to his former fiancee's Instagram on Friday to congratulate her on the news that she and her current fiance are expecting a baby.

WATCH: Tyga Breaks His Silence on Rob Kardashian and Blac Chyna Dating

Instagram

Chyna, 27, and Rob, 29, seemingly confirmed reports of her pregnancy with an emoji of the model with a pregnant belly.

WATCH: Rob Kardashian Proposes to Blac Chyna While Entire Kardashian Family Is Out of Town -- See Their Vacation Videos

Meanwhile Kim, Khloe, and Kourtney Kardashian happen to be enjoying a Cuba vacation, which is somewhat similar to what happened during Chyna and Rob's engagement announcement a month ago, while most of the family was on a trip to Vail, Colorado.

This will be Rob's first child, and Chyna's second. Tyga is currently dating Rob's 18-year-old sister, Kylie Jenner.

WATCH: Tyga Says He's 'Happy' About Blac Chyna's Engagement to Rob Kardashian, Worries Over Son King Cairo's 'Situation'

However, despite being her ex, Tyga has spoken out a couple times in favor of Chyna's new man.

In April, the rapper tweeted, ""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."

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.

— T-Raww (@Tyga) April 6, 2016

"It makes me happy to see the mother of my son happy," he added. "My only concern in this situation is my son. I want him in happy environments."

WATCH: Rob Kardashian Proposes to Blac Chyna While Entire Kardashian Family Is Out of Town

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.

— T-Raww (@Tyga) April 6, 2016

Kylie and Kim also threw their support behind the couple's baby news, each taking the time to like Rob's Instagram photo.

WATCH: Kardashians Call Rob's Engagement to Blac Chyna 'F**ked Up' in Explosive 'KUWTK' Season 12 Promo

This week, a source told ET that while Rob and Chyna's relationship was "tough for [Kylie] in the beginning," she's since gotten over it.

"She sees how happy he is and all she wants is for him to be happy," the source added. "The general consensus in the house is 'Praise Chyna! Don't go!' They finally got the brother they always knew back."