‘KUWTK’ Transformations: See How Kim, Kylie & More Have Changed From Season 1 To 17

The premiere of season 17 of ‘KUWTK’ is just hours away, and you won’t BELIEVE how much the show’s stars have changed since the very first season back in 2007!

It’s been 12 years since the first season of Keeping Up With the Kardashians premiered on E!, and on Sept. 8, the show will debut its groundbreaking 17th season! We’ve watched the famous family grow up before our eyes over the years, but it’s pretty jarring to see just how much they’ve changed from season one until now. Kendall and Kylie Jenner were SO young when they first started filming the reality show — 11 and nine, respectively — and now they’re ALL grown up. They look practically unrecognizable from the little girls they were on day one!

Kendall, who is now 23, started out as awkward pre-teen on KUWTK, and now, she’s one of the world’s hottest supermodels. Along with her growth spurt, Kendall also grew into all her features, and almost looks like a different person. Meanwhile, Kylie, who’s 22, went from a child to a mother in the last 12 years. Although she doesn’t plump up her lips as much as she did in her late teen years, her bigger pout is definitely one of the most drastic differences in her features from season one until now. She literally went from a kid to a grown woman!

It might be Caitlyn Jenner who underwent the biggest transformation of all, though — remember, she was still Bruce Jenner when KUWTK premiered! Caitlyn’s transition into a woman remains one of the most iconic storylines the show has ever had, and although she only appears on KUWTK very rarely these days, she obviously looks much different.

Kim Kardashian, Kourtney Kardashian, Khloe Kardashian, Kris Jenner, Scott Disick and Rob Kardashian have also transformed in big ways since the start of their family’s fame. Click through the gallery above to check out the before and after photos, and tune into KUWTK on Sept. 8 at 9:00 p.m. on E!