We came across a topic in our

Penn Badgley has undergone quite the transformation.

We're not done yet. Click to enlarge then-and-now photos from a half-dozen other Gossip Girl stars. See who's changed and who looks pretty much the same ...

Thanks to the readers who sent us links to Kelly Rutherford's and Michelle Trachtenberg's! We're still on the lookout for Ed Westwick, Taylor Momsen, Connor Paolo and Matthew Settle, and we'll add them to this album when we find them!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.