Blake Lively and Leighton Meester matched in yellow yesterday on the NYC set of Gossip Girl. There's a lot going on for the Upper East Siders this week, as we just got a sneak peek at their fourth season and found out new details about Serena's new love interest. In real life, of course, Blake has been all about her Summer romance with make-out partner Penn Badgley. Leighton, meanwhile, has been all about work lately — during her limited time off from shooting, she traveled to LA to make an appearance at the Teen Choice Awards.
To see more pictures of Blake and Leighton on set, just