Blake Is Definitely Penn's "Girl"

Gossip Girl costars Blake Lively and Penn Badgley take their show-mance public

Speculation about Blake Lively and Penn Badgley has been running thiiiiis high. Well, the cute couple isn't hiding it anymore.

First came the steamy pics from Mexico, and now the Gossip Girl costars are walking hand in hand around Manhattan. It's not usually a good idea to date a coworker, but since these two look pretty adorable together, we're pretty sure HR will let it slide.