Thank u, next.

That is what Ariana Grande, Justin Bieber, Jax Taylor and more stars are saying to 2018 on the last day of the year.

Those three have had quite the transformative years, all dealing with major life milestones in the public eye. And really, what better time to reflect on the last 365 days than on New Year's Eve? 2019 and any resolution-making can wait a few more minutes as we look back on the major changes that went down. 

Sure, a lot of celebrities went through some pretty shocking physical transformations (like Kevin Smith's inspiring weight loss journey), plenty of stars also experienced different kinds of transformations as the world watched. 

Major relationship shake-ups happened. Lifestyle changes went down. Hair was dyed (and twisted into dreads?!). And yes, some pounds were shed, but in the pursuit of health. 

We're looking back on the most shocking celebrity transformations of the year, including a Teen Mom star and a Real Housewife's respective fitness journeys, Joey King's headline making commitment to her new true crime role and more...

The Year In... 2018 Transformations, Ariana Grande

The Year In... 2018 Transformations, Meghan Markle

The Year In... 2018 Transformations, Justin Bieber

The Year In... 2018 Transformations, Joey King

The Year In... 2018 Transformations, Zac Efron

The Year In... 2018 Transformations, Shannon Beador

The Year In... 2018 Transformations, Teresa Giudice

The Year In... 2018 Transformations, Jax Taylor

The Year In... 2018 Transformations, Kevin Smith

The Year In... 2018 Transformations, Arie Luyendyk Jr.

The Year In... 2018 Transformations, Keiynan Lonsdale

The Year In... 2018 Transformations, Rob McElhenney

The Year In... 2018 Transformations, Tyler Baltierra

The Year In... 2018 Transformations, Khloe Kardashian

The Year In... 2018 Transformations, Channing Tatum

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