Pregnant Catelynn Lowell joked about welcoming her "little girl" on Instagram with a picture of her dog. Credit: Theo Wargo/Getty Images

Don't tease Us like that! Teen Mom star Catelynn Lowell can't wait to welcome her second daughter. In fact, she's already preparing for the big reveal with the help of her dog. 

"Our little girl has finally arrived!! #babyv," she captioned a picture of her dog bundled up and cradled in her arms. 

Lowell, 22, and her longtime boyfriend Tyler Baltierra are anxiously awaiting the birth of their baby girl. The couple, who first appeared on MTV's 16 and Pregnant in 2009, placed their daughter Carly up for adoption and documented the challenging decision on the reality TV series and its spin-off, Teen Mom

Our little girl has finally arrived!! #babyv

Zdj?cie zamieszczone przez u?ytkownika Catelynn Lowell (@catelynnmtv) Gru 12, 2014 at 7:44 PST

Lowell and Baltierra plan on raising their second child together. Originally they were supposed to get married in July, but called off the wedding after Baltierra revealed on VH1's Couple's Therapy that he was having second thoughts. 

On Dec. 20, the young father Instagrammed a photo with his love, writing, "She's the best thing that has ever happened to me. She's everything I want that I never knew I needed. She's the most selfless, kind hearted woman that I'm lucky enough to call mine."

Meanwhile, Lowell is just ready to meet her baby girl. On Dec. 14 she tweeted, "I'm SO done being pregnant already come on little one!"