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The course of TV true love never did run smooth.

We've got four sneak peeks of Monday's all-new episode of Gossip Girl, wherein Dan lies  through his teeth to Serena, Chuck bumbles through his new thing with Blair—back off the Bluck, Jack Bass, or we'll cut you!—and oh yeah, Rufus and Lily try to figure out what became of their long-lost love child.

Press play above to see the Derena trouble, and then check out the rest inside...

Gossip Girl airs Monday nights at 8 p.m. on the CW.