Credit: Instagram

Teen Mom 2's Kailyn Lowry turned sweet 21 on March 14, 2013, and she celebrated her birthday with a handful of besties at TGI Friday's. But the only alcohol this little lady consumed was in her Jack Daniel's Sampler. Who needs cocktails when you've got crispy cajun shrimp, are we right?

"Sober living," Kail posted on Instagram, along with a screen shot of a text convo with her pals. Sure, they took a couple of friendly jabs at her squeaky clean birthday plans, but Kailyn's a good sport.

Naturally, fans jumped into the comment thread with their own two cents about the reality star's drinking habits … er, lack thereof. Some assumed that she must be pregnant, because why else would you forego a Blackberry Long Island Tea?! Well, guys, there's a pretty good explanation that does not involve baking buns in the oven.

As we know from Teen Mom 2, Kailyn's mother Suzi has struggled with addiction for as long as Kail can remember. And the young mom to baby Isaac has made it her mission to give her son a better life.

"Put yourself in my shoes for one second," she wrote on her blog last October. "Imagine yourself growing up with a 'parent' struggling with addiction, boyfriend hopping and can’t hold a steady job. Since I was 8 years old I was the parent. I’ve forgiven my mom for not being there, but I’ve also become stronger."

Amen, sister! We totally get why this girl has no interest in drinking, even when some of her fellow Teen Mom 2 co-stars have gotten rowdy on their 21st birthdays. It's a personal choice and quite frankly, none of our business.

Did you guys drink on your 21st birthday? Tell us below, Kailyn Lowry fans!