North and Penelope hand-me-downs! Rob Kardashian and Blac Chyna revealed during the premiere of Rob & Chyna on Sunday, September 11, that they are expecting a baby girl.

The Arthur George sock designer, 29, and Chyna, 28, appeared anxious to find out their baby‘s gender at the doctor’s office. Kardashian, who previously said that he was hoping for a boy, seemed disappointed at first. However, his demeanor quickly changed when he later told his mom, Kris Jenner, the news.

Jenner, 60, and Kim Kardashian were just some to congratulate the pair via Twitter while the E! series aired.

“IT’S A GIRL! So happy for Rob and Chyna! Can’t wait to welcome this new little love bug to the world. #RobandChyna,” Jenner tweeted on Sunday.

The Selfish author, 35, was just as elated. “Congrats @robkardashian & @BLACCHYNA on your baby girl!!!!!!” she wrote. “a girl!!!!!!!!!! how cute is she going to be!!!!!!!”

Khloe Kardashian, who was not always on the best of terms with Chyna, gave a shout-out to the couple too. “So excited to welcome another little princess to our family,” the 32-year-old tweeted. “Congrats Rob & Chyna! I love you both!”

Us Weekly exclusively revealed in July that Rob and the model were expecting a baby girl together. (Chyna already has son King Cairo, 3, with ex Tyga. The rapper is currently dating Kylie Jenner. They’ve been linked since 2014.)

“Rob couldn’t be happier,” an insider previously told Us. “Kris has been giving him baby advice. They get excited talking about the baby.”

Read more fan reactions below: