We didn't meet them until 2009 when their 16 & Pregnant episode aired and since we've pretty much watched them grow up from there, we hadn't noticed how much they'd both changed.
Tyler recently shared the above throwback photo with the caption, "What I looked like when me & Cate met haha!#ThrowBack #Weirdo." He can make fun of himself all he wants, but we think he looks totally adorable!
Catelynn also shared a throwback pic, which was a little more recent. In fact, in the photo (from five years ago), we think Tyler looks pretty much the same, but it's crazy to see how much Catelynn has changed!
Fortunately for us, and all of the other Cate and Ty fans out there, we'll get to see them grow and change even more when Teen Mom returns to MTV later this year.
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Gallery | Teen Mom Couples: Past and Present