Putting together a Teen Mom throwback album feels a bit weird.
So weird, in fact, that featuring their ultrasounds in utero wouldn't be a stretch for the fab four who MTV first introduced us to in 2009.
Since the popular series, which was preceded by 16 & Pregnant, first premiered, a few cast members have had more children.
Maci Bookout and Catelynn Lowell both welcomed new additions in 2015. Jenelle Evans in 2014. Leah Messer has three kids total.
Some have struggled mightily with substance abuse, and at least one infamous "star" enjoys a career in the adult entertainment industry.
Farrah Abraham is in a league of her own, for better or worse.
If you watch Teen Mom online these days, you're watching quasi-celebs in their own right, given the show's surprising staying power.
Yet they were all regular girls at one point, and the authenticity from the olden days still shines through as they progress into adulthood.
With new Teen Mom: OG (original girls, not gangstaz) episodes starting January 4, 2016, let's throw it back to before they were stars ...
Maci Bookout: '16 & Pregnant' Throwback
"Throwback to "16 and Pregnant!" Bentley's mom wrote on Instagram. "I had no idea how much my life would change when I became a parent. I've learned so much about parenthood and teen pregnancy over the years and I encourage you all to do the same."
Caitlynne Lowell and Tyler Baltierra in 2010
"Wow a blast from the past!" Lowell wrote on Instagram. "This is from 5 years ago we are sooo little!"
Leah Messer, Kailyn Lowry, Jenelle Evans, and Chelsea Houska
The cast from 'Teen Mom 2' poses for a photo together in December 2011.
Catelynn Lowell and Tyler Baltierra's Adorable Throwback
The newlyweds in a serious Instagram throwback. "Wow this is from 5 years ago!! I was four months pregnant. Love my babe!" Lowell wrote.
Chelsea Houska: Eyebrow Regrets
"Looking at pictures from high school today just really made me grateful for eyebrow fillers," Teen Mom 2 star Chelsea Houska wrote on Instagram. "No comment on the tongue piercing haa."
Farrah Abraham's Family Flashback
Abraham shared a throwback photo of her mom and daughter, Sofia.