Transformation Tuesday: 15 Stars With The Most Radical Before and Afters

In honor of #TransformationTuesday and inspired by the most drastic celeb transformation we've seen all year (that's you, Miley Cyrus!), here are some of the most radical celebrity makeovers/makeunders we've ever seen, for better or for worse.

She came in like a "Wrecking Ball" and shattered her previous Disney princess image. But let's all remember where Miley Cyrus started off...

As the sweet, teen pop star Hannah Montana. The good ol' days.

Now the svelte style icon and host of E!'s Fashion Police, let's see how far Kelly Osbourne come...

Yup, here's Kelly O in her punk rock stage! Next, the Jersey Shore star we never thought would grow up...

Post Jersey Shore life and motherhood appear to have done wonders for Snooki! Remember when she looked...

Like this? We kinda miss the messy look of the self-proclaimed meatball.

For actor-turned-rapper Drake, "Nothing was the same" after he launched his music career...

Here we see him when he was just starting out as a lead on Degrassi: The Next Generation! What a makeover, dude.

Britney has put in a lot of 'Werk' over the years to change her image from child star to successful female artist. ..

But nothing will ever beat Britney as a teen pop idol. NOTHING, we tell ya.

Jennifer Hudson has transformer her body with amazing weight loss since she first stepped onto the Hollywood scene as an American Idol contestant...

We barely even recognize her here! Keep clicking to see another singing sensation's before and after...

From Stripped, to Back to Basics, to Burlesque, to The Voice, Christina Aguilera always keeps us guessing with what she will do next.

But we all remember her start with "Genie in a Bottle!" So young, so naive, so cute.

All boy band crushes have to grow up someday, and man are we glad this one did! Justin Timberlake has never looked better...

And coming from the blonde curls and gold chain of his *NSYNC days, we prefer JT's more refined 'Suit & Tie' persona.

Fashion designer, fashion icon, mother, and wife, Nicole Richie has really grown up over the years.

But back then, the Simple Life star doesn't even look at all like the Nicole we know today.

Hot In Cleveland's Valerie Bertinelli looks hotter than ever these days thanks to a newfound confidence and some Jenny Craig weight loss. But back then...

...Valerie could use a tip or two in the fashion department. Do you remember her when she looked like this?

Ah, Justin Bieber. He's now got tattoos, a unique sense of style and no longer has the hair that made him famous...

Ahh, look how far he has come! He looks like a "Baby!"

Emma Watson launched herself from child star to model and leader of The Bling Ring, but back then?

It's hard to believe that little Hermoine Granger grew up to be so smokin'.

From meat dresses to clown make-up, Lady Gaga manages to change her appearance often, always topping her previous image...

And here's one of Gaga's earlier, more modest looks when all she had was one hit single, "Just Dance." Good times.

Yup, the Olsen twins have proven they are no longer innocent Michelle Tanner. Now they've got their own fashion lines and legitimate careers...

But for old times sake, here they are pre-fashion icons. The cutest! And finally, the most shocking transformation we never saw coming...

Amanda, Amanda, Amanda. The former Nickelodeon star shocked everyone with her erratic behavior beginning last year. And that wig! Oy!

So let's all try to remember Amanda as she is here, in all her Nickelodeon glory. RIP, All That.