Blake Lively: New 'Gossip Girl' Stills!

Chace Crawford gets close with Sofia Black-D’Elia in this new still from Gossip Girl.

In “High Infidelity,” Trying to prove herself in adult society, Serena (Blake Lively) hosts the Central Park Conservancy’s big gala, of which she is now the newest Board Member, and she and Nate (Crawford) both learn something shocking about their significant others.

Meanwhile, Blair (Leighton Meester) prepares to debut her new fashion line, but a rival from her past holds the key to her future and Chuck (Ed Westwick) tries to persuade Amira (Andrea Gabriel) to help him look into his father’s past, even if it means jeopardizing Lily and Bart’s relationship.

“High Infidelity” premieres on Monday, October 15th @ 8PM ET/PT on the CW.

Blake is also pictured below heading to set on Friday afternoon (September 28).

15+ pics inside…