New Gossip Girl Cast Member Is Really Really Young

[Queens, NY; July 12. Image via Pacific Coast News Online.]

[Queens, NY; July 12. Image via Pacific Coast News Online.]

[New York, December 1. Image via Splash.]
Instead of threesome, it should have been called "Hilary Duff kisses a girl." Here's what happened:
[New York, August 26. Image via Bauer-Griffin.]
[New York, August 3. Image via Bauer-Griffin.]
[New York, March 23. Image via INFDaily.]
[New York, September 9. Image via Splash.]
[Blake Lively & Penn Badgley on the set of "Gossip Girl," Central Park, New York, July 16. Image via Splash.]
[New York, July 7. Image via INFDaily.]
On Saturday night, the cast, executive producers and author of the books that started it all gathered 'round to discuss the cultural phenomenon (and guilty pleasure) that is Gossip Girl at the Paley Festival in Los Angeles. Lucky for us, all the women on the show — Blake Lively, Leighton Meester, Taylor Momsen,…