Departure (2019)

S4E18 The Kids Stay in the Picture

Title: The Kids Stay in the Picture Plot: While Lily braces herself for the fallout from her choices, William van der Woodsen, along with CeCe and Lily's sister, Carol, arrive in town to lend their support and take part in a Taschen photo shoot themed around “modern royalty,” featuring the Rhodes family. Unbeknownst to Carol, who has always kept her daughter Charlie away from the Upper East Side, Charlie has secretly traveled to New York to connect with Serena and the rest of the family. Meanwhile, Blair experiences a revelation about her future and wrestles with the identity of her true partner.