Megan (Joanna Garcia) is forced to cancel her plans for a spa weekend with Jacob (guest star David Giuntoli) when Laurel (Anne Archer) demands she act as chaperone for the pool party Rose (Lucy Hale) and Sage (Ashley Newbrough) are throwing. In an attempt to help repair the relationship between Megan and her sister Lily (Kristina Apgar), Rose convinces Megan she should invite Lily to the party. At first, Megan and Lily seem to be on the road to reconciliation, until Rose realizes her expensive bracelet is missing and Megan accuses Lily of stealing it. Sage breaks out in hives after some jealous girlfriends spike her drink and Megan shuts the party down. Lauren Conrad appears in a cameo role as a party guest. Charlie (Michael Cassidy) admits to Marco (Allan Louis) that he is in love with Megan and is jealous of her new relationships with Jacob and Will (Brian Hallisay).