Celebs are under a slew of scrutiny about their bodies, so it's not surprising that their weight loss can be pretty extreme at times.

Whether or not these famous faces were even overweight to begin with (many looked great with meat on their bones) is up for debate, and for some celebs, their weight loss was more dramatic than healthy.

Some looked a lot better (get it done, Kelly Osbourne!) while others looked gaunt and sick (Matthew McConaughey, we missed your muscles -- we're glad they're back) following their strict regimens. In any case, for some stars, their fluctuating waist lines provided some of us with guilt, some of us with inspiration and all of us with intrigue. Take a gander at the most dramatic celeb slim downs below!

Kelly Osbourne

Weight-Loss-Kelly-Osbourne
Scott Gries / Frederick M. Brown, Getty Images
loading...

Angelina Jolie

Weight-loss-Angelina-Jolie
Kevin Winter / Andreas Rentz, Getty Images
loading...

Kirstie Alley

Weight-loss-Kirstie-Alley
Evan Agostini / Anna Webber, Getty Images
loading...

Christian Bale

Weight-loss-Christian-Bale
Frazer Harrison / Handout, Getty Images
loading...

Mila Kunis

Weight-loss-Mila-Kunis
Peter Kramer / Frazer Harrison, Getty Images
loading...

Cheryl Burke

Weight-loss-Cheryl-Burke
Pacific Coast News (2)
loading...

Hilary Duff

Weight-loss-Hilary-Duff
Evan Agostini / Frazer Harrison, Getty Images
loading...

Courtney Love

Frazer Harrison / Bryan Bedder, Getty Images
Frazer Harrison / Kevin Winter, Getty Images
loading...

Nicole Richie

Weight-loss-nicole-richie
Amanda Edwards / Jamie McCarthy, Getty Images
loading...

Jonah Hill

weight-loss-jonah-hill
Jason Merritt (2), Getty Images
loading...

Snooki

WEight-loss-Snooki
Jason Merritt / Cindy Ord, Getty Images
loading...

Charles Barkley

weight-loss-charles-barkley
Ethan Miller / Jim Rogash, Getty Images
loading...

Kim Kardashian

Kevin Winter / Kevork Djansezian, Getty Images
weight-loss-kim-kardashian
loading...

Matthew McConaughey

weight-loss-matthew-mcconaughey
Pacific Coast News (2)
loading...

Renee Zellweger

Weight-loss-renee-zellweger
Kevin Winter (2), Getty Images
loading...

More From 92 Moose