17 Celebrities Who Became Unrecognizable

Lil Kim. Big plastic surgery.

Lindsay Lohan compared to what she looked like as a fresh-faced teenager, not even 10 full years ago? Pretty astounding and not in a good way.

Renee Zellweger's dramatically different appearance made headlines in October 2014. She barely looks like the same person.

Zach Galifianakis, thinner, younger and mostly un-bearded.

Heidi Montag. Further comment rendered unnecesary.

Haley Joel Osment saw dead people in The Sixth Sense. We look like we've seen a ghost after glancing at this photo comparison.

Zooey Deschanel without her signature bangs is ... not even Zooey Deschanel? That actually is her, but she could easily pass for someone else!

Kylie Jenner is going through puberty, sure ... but does puberty do that?

Jordin Sparks, pop star and American Idol, vs. Jordin Sparks before those things? Pretty dramatic appearance change!

Alexa Ray Joel, daughter of Billy Joel and Christie Brinkley, has undergone quite the "aging" process.

If you saw Louis CK without his goatee and with hair on the top of his head, would you even know it was he?

Lara Flynn Boyle's new "look" is quite something.

Angus T. Jones of Two and a Half Men fame sure grew up fast. And hard ... to comprehend.

Pamela Anderson nowadays (right) marks quite a departure from her more glamorous, famous, pinup days.

Megan Fox in 2014 and 2004.

Yes, that is actually Bristol Palin on the right.

The most shocking thing about this photo of a young Kristen Stewart is that she's actually smiling.