Gossip Girl

Serena makes a mistake at work; Chuck, Nate and Serena attend a party in the Hollywood Hills; Blair and Louis hit a snag while planning their wedding; Dan gets help trying to stop a magazine from publishing an excerpt from his book.

After reconnecting with Diana, Nate receives an exciting opportunity; Serena forces Charlie to make a decision; Blair's future sister-in-law visits.

Diana asks Nate to cross moral lines; Chuck tries to help Dan accept his fate; Serena returns to the Upper East Side.

Dan brings Serena, Blair, Nate, Chuck, Rufus and Lily together to talk about his book; Louis reads Dan's book; Diana uses information about one of Nate's friends to her advantage.

While celebrating Yom Kippur, Blair and Louis wind up in a power struggle with his family; Serena is put in an awkward position by her boss (Michael Michele); Diana expects Nate to remedy an unfortunate situation.

Blair's former minions and Charlie compete for a spot in the royal bridal party; Nate tries to make Diana (Elizabeth Hurley) jealous; Serena's boss (Michael Michele) remains determined to obtain the film rights to Dan's book.