"Teen Mom" star Catelynn Lowell got a second engagement ring from longtime boyfriend Tyler Baltierra on Christmas Day, Us Weekly reported.

"Babe got me a new engagement ring.... I wasn't expecting this at all... it even has a baby diamond on the bottom to represent our new little girl.... thank you so much @tylerbaltierramtv I love you!" she captioned on Instagram where she flashed her new bling.

The couple was engaged before and was supposed to be married this past July but Tyler got cold feet. He appeared on the "Couples Therapy" show on VH1 to admit that he wasn't ready to tie the knot. They later strengthened their bond and are ready for marriage.

Back in 2009, Tyler and Catelynn welcomed their first daughter Carly on the first season of "16 and Pregnant" on MTV. Carly was given up for adoption and the parents stayed in her life while documenting their story on "Teen Mom." They plan on raising their second child together.

Catelynn is due to give birth to another little girl in January, Yahoo! reported.

Tyler wrote on Instagram of his soon to be wife, "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."

Their love story will be told in their upcoming new book "Conquering Chaos," available March 15, 2015.

The "Teen Mom" stars are sure now that they are ready to take care of a child together, E! Online reported. "I am an adult and I can tell when I'm ready," Lowell posted to her Twitter account.

"idc what ANYONE says I'm gonna do me! We ARE READY for a baby. #HatersGonnaHate."

They are happy to raise their next child together and they will not listen to critics who doubt their parenting.