The couple are welcoming a baby girl!
Sean and Tammin already share daughter Phoenix.
"Sean and Tammin, you're having a girl," the doctor says in the clip.
Tammin squeals, "Are you kidding? Are you sure?"
She added: "I'm going to pass out! Oh my God!"
Sean and Tammin shared a hug and Sean joked to the doctor: "You just saved me a lot of money on clothes, we're going to pass those clothes right down!"
The exciting news comes after Tammin revealed she had suffered a devastating miscarriage.
Sharing with fans, Tammin wrote: "Last year on Thanksgiving I was pregnant. I’ve actually been pregnant for a VERY long time (more on that later) but this year looks different.
"And I’m so grateful that our tears have turned to smiles. Remember...'The path from dreams to success does exist. May you have the vision to find it, the courage to get on to it, and the perseverance to follow it'."
Congratulations to the growing family!