Credit: Instagram

Teen Mom's most adorable couple, Tyler Baltierra and Catelynn Lowell, are reportedly pregnant with their second child (squee!), but fear not — they haven't forgotten about their first kiddo, Carly!

This dynamic duo placed Carly up for adoption after getting unexpectedly pregnant at the super-young age of sixteen, but they've maintained a great relationship with her thanks to an "open adoption" with Carly's parents.

Basically, they get to see Carly about once a year, and are in frequent email and phone contact, which comes in especially handy around Carly's birthday. You better believe that Cate and Ty send her of tons of presents, and celebrate good times!

"Tomorrow our little girl turns five! Crazy how time flys [sic]!" Catelynn tweeted on May 17, while Tyler also took to the social networking site to say, "Happy Birthday Carly! I can't believe she's 5 today #TimeFlys #MissHer."

We can't imagine how hard it must be for Catelynn and Tyler not to be with Carly for her fifth birthday. These two are such amazing parents, and we're so happy that they're getting another chance at being the best mom and dad ever now that Catelynn is rumored to be pregnant!

How do you think Carly will handle the news that her birth parents are expecting? Let us know below!