Star Yael Grobglas takes PEOPLE inside the moment that Petra gives birth to twins on The CW dramedy's March 7 episode

FIRST LOOK: Jane the Virgin Welcomes Two Tiny (and Adorable) New Costars

Jane the Virgin just got a little cuter.

Petra (Yael Grobglas) will give birth to twins on the March 7 episode of the CW dramedy – and PEOPLE has the First Look at the happy occasion.

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“Rafael is late so Jane steps in and is really there for Petra while she is giving birth,” Grobglas – who is featured in the current issue of PEOPLE – says of how her character welcomes her twins into the world. “Petra has worked really hard to have a guard up because of what she’s gone through and becoming a mom is forcing her to be real and accept help from Jane.”

Fans of the show have watched as Petra and Jane ( Gina Rodriguez) have transformed from nemeses in love with the same man (Justin Baldoni) to two young mothers with an almost sisterly bond.

“It’s been amazing to see Jane and Petra’s relationship grow,” Grobglas, 31, says of the characters’ developing kinship. “And as an actress, it was great having Gina in my corner that day.”

Groblas has enjoyed watching her character grow and develop over the past two seasons and is thrilled fans will be given the opportunity to see Petra as a mom.

“Jane has been such a gift for me. The show has been an incredible opportunity to grow and learn and the cast has become like family to me,” she says. “Petra has grown from being just a villain to being a really nuanced character. And now that Petra is going to be a mom, the viewers are going to get to see a completely new side of her.”

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And although she wasn’t giving birth for real, Grobglas says she has a new-found respect for the birthing process.

“I prepared by watching birthing videos, which was terrifying but beautiful,” she says. “And on the day of filming, I had to breathe heavy for about 12 hours and almost passed out. I was so glad to have a great crew member there watching out for me and making sure I had water and rested when I needed to. If that was what it was like giving fake birth, I can’t even begin to imagine what it would be like to actually give birth one day.”