Gossip Girl isn't the only popular show set for a spin-off. CBS is hoping that they can capitalize on the success of NCIS with their own spin-0ff.
Ironically enough, NCIS started as an episode spin-off of JAG. Now NCIS will host the episode that spins off a new show. CBS hasn't announced any casting progress, or given any details on how the new show will function.
Gibbs might have to pull double duty if they expect this one to work.