If one thing is true about celebrities, it is that they are constantly changing their looks.
Sometimes they just want toswitch things upand, really, why shouldn’t they?
Here’s a look at some of the most dramatic celebrity changes over the years.

Before that, though, Pratt was busy stealing the show over onNBC’sParks and Recreationas Andy Dwyer.
Pratt has been very open about his weight loss journey, even documenting some of it on Instagram.
In one throwback photo, Pratt evenshared his weight nearly 300 pounds.

It may seem Pratt lost weight overnight but in reality, it took quite a bit of patience.
He explained in aninterview withClevver, “It took a long time.
The secret is: you might’t do it in a month.

It takes eight months, or a year, or a lifetime.”
If you want to be in good shape then get on it today."
Sadly, Osbourne was heavily criticized for her weight.

She toldShape Magazine, “I was called fat and ugly in the press almost my entire life.
It sets you up to hate yourself in a huge way.”
Since 2002, Osbourne’s weight has fluctuated.

It wasn’t until joiningDancing with the Starsin 2009 that Osbourne made real lasting changes.
“[N]ow, when I’m full?
Always one to experiment with trends, Osbourne joinedFashion Policeand shared her style insight and critiques for five years.

Plumped lips and possibly more?
When you look at pictures of Kylie Jenner from back in 2008, you might not believe your eyes.
At that time, Jenner was only 11 years old.

At 21, you’d expect her to look different, no doubt.
What if I came out and said, ‘Oh, yeah, I got my lips done’?
What are all those moms going to think about me?

These kids, my fans, they’re going to think I’m crazy.
I didn’t want to be a bad influence.”
I wish I had just been honest and upfront."

Every single day there was a news story about me."
Two years later, Jenner again sat down with theABC Newsjournalist.
This time, however, Bruce was nowhere to be found.

“Do you miss being Bruce?”
Jenner responded quickly, “No.
Not even close.”

To have a beautiful shot of my authentic self was important and the shock value …
I wanted to end the old Bruce, my old life, and that picture did it."
From fat-shamed to fit-shamed
Khloe Kardashian is possibly the most cruelly criticized Kardashian sister.
Kardashian’s weight has fluctuated over the years and all the while, she endured criticism.
In 2012, Kardashian said toUs Weekly, “I’m a size 6/8.
If I weren’t in Hollywood world, no one would ever say I was fat.”
By 2016, Kardashian had begun the transformation of a lifetime.
After some time, Kardashian also decided to get a trainer and credits him for changing her body.
However, haters will still hate.
Kardashian further explained, “Some people were like, ‘It took you so long to lose weight’ …
But some [other] people were like, ‘I liked you better when you were fat.’
I get body-shamed now that I work out!
But I don’t care what weight I am.
It’s genuinely about me being healthy.”
So much so that he diminishes his role in the show.
“Let’s face it, I barely spoke!”
Leto also apparently dressed up as the pope.
“[T]his could all be some big game, as well.
Who knows if this is even real as we perceive real to be,” he explained.
Ironically, he’s still a heartthrob, despite his earlier objections.
Is she still charming?
She attempted to clarify, “Not in a bad way.”
And if they offered her a chance to reprise her role?
McGowan responded, “Longterm television freaks me out.”
McGowan has changed quite a bit since she first premiered onCharmedin 1998.
However, her most dramatic changes came in 2007 and 2015.
Sadly, McGowan suffered a traumatic injury in a car accident in 2007.
My glasses had sliced me under my eye."
In an effort to reduce scarring, McGowan had plastic surgery.
In 2015, McGowan decided to change her look on her own terms.
In avideo she shared on Instagram, a hair stylist was shown buzzing away McGowan’s black pixie-length hair.
That look definitely took some major confidence.
In 2018, McGowan appears to have grown her hair back just a bit.
Either way, it’s still an edgy look.
Granted, Ventimiglia’s role as Jess and his role as Jack are not exactly similar.
Oh, and he has a mustache.
“People started to look at me and say, ‘Wow, you’ve grown up.
Did you get taller?'”
he said, reportedly laughing.
If you were always rooting for Team Jess, it may be time to support Team Jack too!
Fast forward some ten years and Swift has won ten Grammy awards.
She’s also been nominated a total of 31 times.
Throughout the years, Swift’s music has transformed.
Her look has also changed pretty dramatically, especially with the release of the 2017 albumReputation.
After all, theold Taylor is supposedly dead.
Why did Letterman retire?
Simply put, it was just time to do other things.
“I have spent half my time behind this desk.
Essentially, half his life.
Now that Letterman was free to let his hair down,he did exactly that.
Well, sort of.
He actually shaved his head and grew out a long white beard, resembling another popular jolly fellow.
But this doesn’t mean he ditched the beard.
In fact, it looks like he actually grew it out some more.