"We waited so long that we decided to double up!" Kym and Robert told People. "We are very grateful for the blessing of twins."
Kym confirmed her pregnancy via Instagram on Monday, and on Tuesday, Kym posted a picture of her little white dog standing behind the book Good Dog, Happy Baby: Preparing Your Dog for the Arrival of Your Child.
"Shouldn't it be the other way around?! Happy Dog, Good Baby... I have a feeling we're really going to need this!" Kym wrote.
Kym and Robert met and seemingly fell in love on Dancing with the Stars' 20th season in Spring 2015 when they competed as a professional and celebrity pairing, and they continued to date after finishing the competition in sixth place.