How hard was it to keep the cameos [Lisa Loeb, Rachel Bilson, Mayor Bloomberg] a secret?

We were so happy that none of them got out. With Mayor Bloomberg, were able to shoot in the city when he was available. It was all very dramatic with him coming in the back door so the paparazzi wouldn't see him and we shot inside. Jessica [Szohr] was in town for a movie. She did her cameo on the set of Carrie Diaries and it's Carrie Bradshaw's '80s kitchen she's standing in. And Rachel Bilson and Kristen Bell shot on the set of Hart of Dixie. We didn't send dailies out, we didn't send out to international partners, we didn't send the last two acts to anyone. We really tried to control spoilers.

The paparazzi got wedding photos of Chuck and Blair and Dan and Serena. Was that expected or were you disappointed that happened?

The Chuck and Blair wedding, we knew as soon as we stepped outside, it would be captured by the paparazzi. But Dan and Serena, that was really disappointing and upsetting. We worked really hard to dress Blake inside, she kept away from the windows. It was a locked set. But somebody either paid someone to get into the apartment across the street, or used a fire escape and used a telephoto lens, and that really upset me because I didn't want anyone to know. I wanted that to be a surprise for fans.

Where can we start a petition for a spinoff with Jack and Georgina? Did you consider doing a whole storyline with them earlier?

Always. We always talked about them being in some ways the male and female versions of each other and perfect for each other. We love Desmond [Harrington]. We have to work around his Dexter schedule which means we only got him for one episode this season. And then we realized that Jack and Georgina had never met, and so we had the opportunity to have a fun little pilot story where it's just slight but getting them together for the first time, which was super fun.