she sees Jenny trying to kiss Nate. Nate kicks Jenny out of the apartment to reconcile with Serena, spurning Jenny's advances. During Dorota's wedding, Serena leaves with Carter and gives Jenny a message telling Nate that she has found her father. Serena soon finds out that Carter has been delaying her in an attempt to get close to her and leaves him, flies alone. Upon arriving, she is shocked to find her mother answering the hotel door, assuming that she had been in Canyon Ranch the entire time. William van der Woodsen (William Baldwin) returns, making Serena happy but is unknowingly dragged into her father's plot to win back his ex-wife. The plot nearly works until Jenny, Blair, Nate and Chuck scheme against William, who had been trying to frame Rufus for adultery and intentionally misdiagnosing Lily, and William leaves. Her father's departure leads to Dan comforting her and reignites her feelings for him. Serena sleeps over at Dan's and wake up to find themselves in a compromising position, one that Jenny photographs and sends to Gossip Girl. As the photo spreads, Nate and Serena temporarily end their relationship and she joins Blair for a summer in Paris. Season 4 Serena is seen spending her summer in Paris with Blair, reluctant to tell Blair that she has enrolled in Columbia, something that Blair fears will have them return to their high school pettiness, when she receives news that Chuck might be dead. After an unfortunate double date involving a handsome royal, Blair eventually forgives her. Chuck's arrival and a visit to a Parisian morgue confirms that he is alive but Serena pursues him in hopes of convincing him to return to New York when he tries to run away to London. She returns to New York having made her decision between Dan and Nate but her decision becomes irrelevant when she sees them with their new respective significant others, Vanessa and Juliet Sharp (Katie Cassidy), a girl with a personal vendetta against Serena. Serena's enrollment in Columbia has her face Juliet's many attempts at getting rid of her, ranging from excluding her from an exclusive society along with driving Blair against her, exposing her relationship with her professor, Colin Forrester (Sam Page), who happens to be Juliet's cousin to get her kicked out, and spreading various rumors about Serena, who manages to evade these attempts. Juliet then recruits Jenny and