| Episode cast overview, first billed only: | |||
| Blake Lively | ... | Serena van der Woodsen | |
| Leighton Meester | ... | Blair Waldorf | |
| Penn Badgley | ... | Dan Humphrey | |
| Chace Crawford | ... | Nate Archibald | |
| Taylor Momsen | ... | Jenny Humphrey | |
| Ed Westwick | ... | Chuck Bass | |
| Jessica Szohr | ... | Vanessa Abrams (credit only) | |
| Kelly Rutherford | ... | Lily van der Woodsen | |
| Matthew Settle | ... | Rufus Humphrey | |
| Margaret Colin | ... | Eleanor Waldorf | |
| Caroline Lagerfelt | ... | Celia 'CeCe' Rhodes (voice) | |
| Connor Paolo | ... | Eric van der Woodsen | |
| Wallace Shawn | ... | Cyrus Rose | |
| Sebastian Stan | ... | Carter Baizen | |
| Zuzanna Szadkowski | ... | Dorota Kishlovsky | |
Chuck offers to throw a wedding for a very pregnant Dorota who insists that she and Vanya have a traditional wedding before her parents arrive from Poland and find their daughter pregnant and without a husband. Dorota asks Blair and Chuck to be part of the ceremony and walk her down the aisle. Serena tells Nate she is having breakfast with the Humphreys when in reality she's secretly meeting up with Carter Baizen. Rufus discovers that Lily has been lying to him about her whereabouts. Written by CW Publicity