In the headline of this article, we don't mean Blake Lively switches teams in the same way Chuck Bass will later this fall on Gossip Girl (according to spoilers).

Only in the baseball sense. While she stars on a New York-based show in Gossip Girl, the pretty actress is also appearing in a Boston-based movie, The Town.

Blake was spotted with the film's star and director, Ben Affleck, on the set yesterday, donning Red Sox gear. New York baseball fans may not approve of that!

Then again, L.A. native Blake is probably a Dodgers fan. In any case, here's the star, who just celebrated her 22nd birthday, filming with Ben in Beantown ...

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