Catelynn Lowell and Tyler Baltierra: Through the Years

Catelynn Lowell and Tyler Baltierra welcomed their second child on New Year's Day 2015.

Catelynn Lowell and Tyler Baltierra. They have been together so long!

Catelynn Lowell and Tyler Baltierra are hitting back at critics of their decision to place their child up for adoption ... in 2009.

Tyler Baltierra and Catelynn Lowell kiss and share a sweet moment on Instagram.

Catelynn and Tyler from Teen Mom. They're the only committed couple on the show.

Catelynn Lowell and Tyler Baltierra of Teen Mom fame still hit it. A lot.

Catelynn and Tyler from Teen Mom. They are no longer going to get married it appears.

Catelynn Lowell and Tyler Baltierra are graduating! What a feat for the youngsters!

Catelynn Lowell and Tyler Baltierra have graduated high school! Congratulations you kids!

Catelynn Lowell is pregnant! Can you believe it? The Teen Mom star is expecting baby #2.

Catelynn Lowell and Tyler Baltierra celebrate their daughter's second birthday. Their daughter who they gave up for adoption.

Catelynn Lowell and Tyler Baltierra of Teen Mom fame. Look at them all snuggly.

Catelynn Lowell is pregnant for the second time. Here is the baby bump photo to prove it.

Catelynn Lowell and Tyler Baltierra of Teen Mom fame. Such a nice and remarkably stable couple.

Catelynn and Tyler on a recent episode of Teen Mom OG with their new baby NOVALEE REIGN!!