Today is Catelynn's big day (she tweeted her excitement last night!) and Thursday is Kailyn's, so we obviously had to celebrate here at OKMagazine.com and have you partake in the celebrations as well.
So, in honor of the girls' big 2-1, you need to vote for your favorite birthday girl! You can vote for Catelynn because she and Tyler are the cutest. You can vote for Kailyn because Isaac is so adorable it hurts. Or, you can vote based on if you like Teen Mom or Teen Mom 2 better overall. But whatever you do, you NEED to vote!