Catelynn Lowell and Novalee Reign Baltierra

Being your mommy is the best thing in the world.... you make my days brighter ????????

A photo posted by Catelynn Lowell (@catelynnmtv) on Mar 17, 2015 at 9:48am PDT

Her very own little princess! Catelynn Lowell could not be more in love with her baby girl, Novalee Reign — and she wants the whole world to know it.

On Tuesday, March 17, the Teen Mom OG star took to Instagram with an adorable photo of her 2-month-old daughter, whom she and fiance Tyler Baltierra welcomed earlier this year. In it, she cradles Novalee close to her chest and leans down to plant a sweet kiss on the tot's cheek.

"Being your mommy is the best thing in the world.... you make my days brighter," Lowell, 22, captioned the pic.

The MTV reality star — who, as seen on 16 and Pregnant in 2009, placed her first daughter Carly, now 5, for adoption — gave birth to Novalee on Jan. 1. She and Baltierra have been in baby heaven ever since.

"You are already my world...I love you so much, you have already changed me in so many ways," Lowell wrote via Instagram on Jan. 2. "Mommy and daddy love you."

Last month, the lovebirds even got tattoos in honor of their little bundle of joy. Lowell got Nova's footprint on the top of her own foot, while Baltierra inked their daughter's name in a Batman symbol.