Melissa Hastings Thomas (Torrey DeVitto) is Spencer's older sister, who was engaged to Wren. Melissa is the family's "perfect child", and treats Spencer cruelly. When she catches Wren kissing Spencer, she demands he move out. When her previous boyfriend, Ian, returns, she is reluctant to see him, but they end up happily eloping in the winter premiere "Moments Later". They also quietly marry, much to Spencer and her mother's shock. It is revealed in "Know Your Frenemies" that she is trying to get pregnant with Ian. It was supposed to be kept a secret but Spencer saw an ovulation kit belonging to Melissa. When Spencer asks why she wants to be pregnant, Melissa says she always wanted a big family. However, she never mentioned this in her life. She also said that winning and getting her way wasn't important to her anymore, even though Spencer said "but you wanted those things last WEEK!" Spencer promises to keep the secret, but she tells Hanna when they're at school.

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