Blake Lively and Sebastian Stan were spotted in the Brooklyn Botanical Gardens yesterday afternoon, filming scenes for the upcoming Season 3 of Gossip Girl.

What do you suppose Serena and Carter are talking about?

As executive producer Stephanie Savage teased in some recent Gossip Girl spoilers, these two are brought together by an important story line early this season.

To at least some degree, we know it involves Serena's long-lost father Keith. But how this potential couple deals with it - and each other - remains to be seen.

Click to enlarge more photos of Blake Lively and Sebastian Stan (the real-life love of Blake's co-star Leighton Meester) filming on a beautiful day in Brooklyn:

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