when do serena and blair became friends again
Serena van der Woodsen The first season introduces Serena as the beautiful, wealthy daughter of divorced parents who returns from boarding school. Her return sparks her old rivalry with her best friend, Blair. Serena's return is due to her younger brother, Eric van der Woodsen, who attempted suicide, and is considered unwelcome, most so by her old best friend Blair, who has always seen Serena as a threat to her reign as Queen Bee of Constance. After Serena successfully reconciles with her, Chuck Bass reveals to Serena that he knows the cause of her sudden departure prior to the first season - taking Nate Archibald's (Blair's boyfriend) virginity during a wedding,[9] and he attempts to kiss her. Serena manages to escape and runs into Dan, a St. Jude's student from Brooklyn, who often expresses cynicism about the lifestyle his wealthier classmates lead. Serena also finds a friend in Jenny Humphrey, Dan's younger sister. Nate eventually reveals his tryst with Serena to Blair, and Serena is ostracized in the first few episodes of the show.[10] Blair and Serena consistently fight and reconcile throughout the show's subsequent episodes, often dealing with Serena's tendency to overshadow Blair.[11] Serena and Blair reconcile after a heartfelt confrontation that prompted Serena to admit her mistake with Nate and leaving Blair in her time of need.[12]
Emily Prentiss Brewster returned for guest appearances in the season 9 episode "200" in 2014 and the season 11 episode "Tribute" in early 2016 before returning as a regular cast member in the season 12 episode "Taboo" later in the year.[18]
Blair Waldorf In the fifth season premiere, Blair continues to plan her wedding, but begins to encounter problems in her relationship with Louis. It is later revealed that she is pregnant.[23] Blair tells Chuck that the child is Louis', and states that part of her wanted Chuck to be the father.[68] Dan becomes Blair's confidante and is shown to be in love with her, though she remains oblivious to his feelings and states that there is nothing more than friendship between them.
Ann Perkins In the season six premiere, Ann reveals that she is back together with Chris, and she is pregnant.