Karina posted an Instagram photo of herself smiling and holding up a positive pregnancy test. She was also flashing fans the peace sign.
"Thanks @FirstReponsePregnancy for confirming that I will have a little one to train on the dance floor! #BabySmirnoff coming in 2020!" Karina, 41, captioned the photo.
"And since it's the holiday season, it's the perfect time to give back! I'm happily going to donate $5K to @ResolveOrg to support all couples and families on their pregnancy journeys. Everyone have a great holiday! #Ad #BabyBabyBaby #2MeansYes #FirstResponse #6DaysSooner #FirstAndOnlyResponse #happyholidays2016."
Karina said she's "super excited to start a new chapter" in her life, Peoplereported.
"I've always wanted to be a mom. I have so many emotions that I'm going through. I'm nervous, excited, over the moon happy and overwhelmed," the brunette beauty gushed to the magazine.
"Everyone has been so great, gracious and has given me so much information. I'm just trying to keep up! But I'm very grateful for the gift I've been given. I can't wait to be a mom."
Karina reportedly chose not to disclose the identity of the father.
The pro dancer and choreographer has been wanting a child in her life for years now.
Karina won the Dancing with the Stars' mirrorball trophy one time with J.R. Martinez in Season 13. The last time she competed as a pro on the reality dancing competition was Season 22 with Doug Flutie.