The daughter of Tyler Baltierra, novice, looks at the sonogram of his little brother: video

The little girl of Tyler and Catelynn Baltierra is ready to be a big sister!

The proud 26-year-old father shared an adorable video of his three-and-a-half-year-old daughter, Novalee Reign, holding a copy of her little brother's sonogram on Tuesday.

"She is so excited to be a big sister and she just melts Dad's heart to see her so happy! N #NovaleeReign #BabyBaltierra, "the Teen Mom OG star wrote in the legend.

Tyler is expecting his third child with his wife Catelynn, 26 years old. They also share their nine-year-old daughter Carly, whom they have placed for adoption in 2009.

Novalee could not contain her enthusiasm and she happily said, "She beckons me!" Kissing Catelynn's scan picture.

RELATED: Teen Mom OGCatelynn Lowell and Tyler Baltierra wait for their third child together

"It's a tiny baby!" She said, hopping.

Last month, the expectant mother gave her fans a first glimpse of her future child on Instagram. "Can not wait to meet you a little nugget," writes Catelynn next to the sonogram.

The couple announced in September that they were expecting another baby after Catelynn's miscarriage last year. In an interview with PEOPLE later this month, Catelynn said she was putting her pregnancy "in the hands of God."

RELATED VIDEO: Teen mom & # 39;s Tyler Baltierra says Catelynn was thinking of "ways of killing oneself" before being rehabilitated

"I think there will always be something in the back of your head when you have to miscarry, for example," said Catelynn. "But I mean, I was right – I put it in the hands of God, really. Whatever happens, he is supposed to happen and I adhere to his plan.

Now, she is very happy to see her youngest daughter interact with a younger brother or sister.

Tyler Baltierra / Instagram. Sidebar: Mike Coppola / Getty

"I'm really excited to see Nova as a big sister," she said. "She is super excited. She's always asking questions and she's asking me now why she has not been revealed yet and I thought, "Well, because her arms and legs are growing" and so on. "

Catelynn and Tyler have been together for 13 years and celebrated their third wedding anniversary in August.