We're not crying, you're crying!

It's been eight years (yes, eight) since Catelynn Lowell and hubby Tyler Baltierra gave up their daughter, Carly on season 1 of MTV's 16 and Pregnant, but the couple clearly still thinks about their firstborn all the time.

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On Thursday, the reality star posted a tweet saying, "8 years ago 2day at 10:39 am Carly took her first breath… 8 yes she's 8!!! This little girl has made my world! I love you Carly!"

Pass the tissues!

The middle school sweethearts have been together for 12 years and arguably endured more than most couples do in a lifetime. Together, they've tackled the adoption process, family issues, postpartum depression, and countless therapy sessions, as documented on Teen Mom OG.

Luckily, the pair now seem to be in a good place. Catelynn and Tyler got married in August 2015 and had their second daughter, Novalee Reign, earlier that same year.

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Today, the power couple are in the process of creating their own children's clothing line, and we can't wait to see what they do next — and how many more babies they'll have.

In the meantime, Happy Birthday, Carly!

Learn more about Catelynn and Tyler's adorable relationship by scrolling through our gallery!