Joseph Gordon-Levitt's Transformation From Alien to Hot Heartthrob

Joseph Gordon-Levitt is one of Hollywood's hottest guys, but he wasn't always this way. Back in the '90s, when he started his career as an alien on 3rd Rock From the Sun, no one would have guessed that he would later transform into one of the most swoon-worthy celebs. Through the years, JGL has donned many looks for roles and in real life, including a bulked-up New Jersey sex addict, a goofy-faced lip-syncer, and even yoda, so in honor of our lifelong crush on him, we've rounded them all up here.

3rd Rock From the Sun Wasn't His Best Look, but He Was Still Young in the '90s!
NBC

3rd Rock From the Sun Wasn't His Best Look, but He Was Still Young in the '90s!

Back in 2001, He and Zooey Deschanel Looked Completely Different
Getty | J. Vespa

Back in 2001, He and Zooey Deschanel Looked Completely Different

At the Treasure Planet Premiere in 2002, This Outfit Happened
Getty | Albert L. Ortega

At the Treasure Planet Premiere in 2002, This Outfit Happened

In 2003, This Almost-Bowl-Cut Look Was Not a Favorite
Getty | Stephen Lovekin

In 2003, This Almost-Bowl-Cut Look Was Not a Favorite

The "Long Hair, Don't Care" Mentality Returned in 2004
Getty | Peter Kramer

The "Long Hair, Don't Care" Mentality Returned in 2004

And He Brought Along Hot-Pink, Patterned Outfits in 2005
Getty | Tony Barson

And He Brought Along Hot-Pink, Patterned Outfits in 2005

Then, Without Warning, in 2007, He Was Completely Clean Cut
Getty | Munawar Hosain

Then, Without Warning, in 2007, He Was Completely Clean Cut

But It Was Followed by This Sexy, Scruffy Face For the Film Uncertainty
Getty | Marcel Thomas

But It Was Followed by This Sexy, Scruffy Face For the Film Uncertainty

Then in 2008, He Was Smoldering in Every Way
Getty | Kevin Winter

Then in 2008, He Was Smoldering in Every Way

He Brought Clean-Shaven Smirks in 2008, Too
Getty | Alberto E. Rodriguez

He Brought Clean-Shaven Smirks in 2008, Too

When (500) Days of Summer Happened in 2009, We Had 500 Reasons to Love Joseph
Getty | Jeff Vespa

When (500) Days of Summer Happened in 2009, We Had 500 Reasons to Love Joseph

This Bow Tie Wowed Us in 2010
Getty | Duffy-Marie Arnoult

This Bow Tie Wowed Us in 2010

Through the Years, His Goofy Faces Have Always Been Hot
Getty

Through the Years, His Goofy Faces Have Always Been Hot

And When He Sang in 2010, We Nearly Died
Getty | Lester Cohen

And When He Sang in 2010, We Nearly Died

He Even Looks Great in Uniform, as Seen in The Dark Knight Rises
Getty | Marcel Thomas

He Even Looks Great in Uniform, as Seen in The Dark Knight Rises

When He Got New Frames in 2012, He Made Glasses Sexy
Getty | Michael Tran

When He Got New Frames in 2012, He Made Glasses Sexy

Yep, Glasses Just Work on Him
Getty

Yep, Glasses Just Work on Him

OK, Just Look at This Smirk. Who Can Deny That?
Getty | Pascal Le Segretain

OK, Just Look at This Smirk. Who Can Deny That?

In 2013, He Displayed His Goofy Charm Yet Again
Getty | Jason Merritt

In 2013, He Displayed His Goofy Charm Yet Again

His Lip-Sync Battle on Late Night With Jimmy Fallon Was a Win
Getty | Theo Wargo

His Lip-Sync Battle on Late Night With Jimmy Fallon Was a Win

Slow-Motion Running, Anyone?
Getty | Jason Merritt

Slow-Motion Running, Anyone?

In 2013's Don Jon, His Bulked-Up Sex Addict Character Even Did It For Us
Getty

In 2013's Don Jon, His Bulked-Up Sex Addict Character Even Did It For Us

When He Got Goofy With Tony Danza in 2013, Our Hearts Stopped
Getty | Larry Busacca

When He Got Goofy With Tony Danza in 2013, Our Hearts Stopped

Here He Is With 3rd Rock Costar John Lithgow, 13 Years Later
Getty | Jonathan Leibson

Here He Is With 3rd Rock Costar John Lithgow, 13 Years Later

If Looks Could Kill, His Sharp Oscars Ensemble in 2014 Would Definitely Be Deadly
Getty

If Looks Could Kill, His Sharp Oscars Ensemble in 2014 Would Definitely Be Deadly

JGL Showed Everyone on the Star Wars: The Force Awakens Red Carpet How It's Done
Getty

JGL Showed Everyone on the Star Wars: The Force Awakens Red Carpet How It's Done

He Was Named Hasty Pudding Man of the Year in 2016, Resulting in Whatever Is Happening Here
Getty

He Was Named Hasty Pudding Man of the Year in 2016, Resulting in Whatever Is Happening Here