Blake Lively & Penn Badgley: 'Gossip Girl' Friday Fun!

Blake Lively and Penn Badgley keep hydrated on the set of their show Gossip Girl on Friday (October 12) in New York City.

The co-stars and former couple were joined on set by their castmates Chace Crawford and guest star Desmond Harrington.

PHOTOS: Check out the latest pics of Blake Lively

Desmond, who is one of the stars of Showtime’s Dexter, plays Jack Bass, the evil uncle of Ed Westwick‘s character Chuck.

Make sure to tune in for a new episode of Gossip Girl on Monday, October 15 at 9/8c on The CW!