3.05 "Rufus Getting Married"

Lily and Rufus decide to move up their wedding to the next day, but a series of complications threaten to tear them back apart again. Meanwhile, Chuck discovers a secret that Carter has been keeping from Serena which involves Nate's girlfriend Bree and her family whom are out to get Carter. Dan and Vanessa are pulled into one of Georgina's schemes when she threatens to ruin Lily and Rufus' wedding by revealing the secret about Scott Rosson as their illegitimate son. Also, Blair is suspicious of Bree and shares her concerns with Nate that she may have an agenda regarding him and Carter.