Monday on Gossip Girl, Chuck compared himself and Blair to Brad and Angelina. On November 29, she likens them more to Bruce and Demi, separated but still cordial.

At least that's how she wants it to be, otherwise run-ins like this one on Thanksgiving are going to be increasingly awkward. But there are bigger issues at play here.

In the below sneak peek of "Gaslit," the gang makes a startling realization: No one knows where Serena is. We do, of course, and we're worried. Watch the clip below ...

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