Credit: Instagram

It's Teen Mom Catelynn Lowell's birthday you guys! Time to slip into a party dress, wave your hands in the air like you just don't care, and binge on some cake. This adorable girl next door was born on March 12, 1992, and you know what that means … this isn't just any birthday for Catelynn –– it's her big 21!

"Guess whose birthday it is tomorrow?!?!?!?" Catelynn tweeted to her legions of followers on March 11. "MINE!! 21 tomorrow and so excited!!"

OMG, Cate's turning 21! Finally, she can legally drink boxes of Franzia. But as far as we know, girlfriend isn't much of a party girl … unless your idea of a good time is bonding with your dogs, chatting about how much you love your fiancé, and being certifiably perfect all the time. Then, she’s your kind of party animal!

The Teen Mom starlet has stayed hush-hush about her birthday plans so far, but considering her birthday coincides with St. Patrick's Day weekend, we're pretty sure Cate will spend the weekend drinking Guinness, tattooing four-leaf clovers on her lower back, searching for leprechauns, and buying a bunch of Lisa Frank rainbow-covered binders. And there's no doubt that Catelynn's fiancé, Teen Mom's Tyler Baltierra, will treat his lady like a queen!

Happy Birthday, Catelynn! We raise our glasses of wine in your honor!

Make sure to head over to Catelynn's Twitter and wish her many happy returns, Teen Momers.