The secret is out … ’cause “The Secret Lives of Mormon Wives” star Mikayla Matthews is expecting baby number four!

Mikayla just revealed the big news on IG, sharing adorable pics with her hubby Jace and their three kiddos — Tommie, Haven, and Beckham — along with a peek at her fourth via an ultrasound scan.

The post is full of heartwarming moments, like Jace gently cradling Mikayla’s baby bump and their kids bouncing off the walls with energy and excitement.

Mikayla shared with PEOPLE the news was a complete surprise, especially considering she didn’t think pregnancy was even possible for her due to some ongoing health issues.

She’s got her hands full for sure — juggling a pregnancy, filming season two of the Hulu series … and all the drama that comes with it.