Season 3 Episode 22

full size Blair and Chuck Have a Heart to Heart in Episode 3.22, "Last Tango, Then Paris"

Title: Last Tango, Then Paris
Air Date: May 17, 2010 at 12:00 AM PDT

Blair must decide whether to meet Chuck at the top of the Empire State Building or risk losing their future together.  A Gossip Girl gossip bomb involving Dan explodes Serena and Nate’s relationship.  Dorota and Vanya welcome their baby.  Jenny hits rock bottom.  Georgina returns to the Upper East Side…and she has an agenda. (From CWTV.com)