The fourth episode of Gossip Girl's fourth season, "A Touch of Eva," airs on October 4. "The Undergraduates" airs this coming Monday, September 27 (see link for that photo gallery).

In "A Touch of Eva," Blair schemes to undermine Chuck's newfound happiness with the girl for whom the episode is titled. How will she attempt that, and will she be successful?

Meanwhile, Nate suspects that Juliet is keeping a secret and decides to confront her, and Dan is torn between feelings for Serena and Vanessa. Click to enlarge the pics below ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.