Sarah Rafferty (born December 6, 1972)[1] is an American actress, best known for her role as Donna Roberta Paulsen on the USA Network legal drama Suits and for her role as Katherine Walter on the American teen drama My Life with the Walter Boys, for which she received a Children's and Family Emmy Award nomination in the Outstanding Supporting Performer category.

Rafferty grew up as the youngest of four daughters in the Riverside neighborhood of Greenwich, Connecticut;[2] she studied at Phillips Academy in Andover, Massachusetts, graduating in 1989.

Majoring in English and Theatre at Hamilton College, she studied theatre in the United Kingdom at the University of Oxford during her junior year and, after graduating magna cum laude from Hamilton in 1993,[3] went on to study at the Yale School of Drama, where she received a Master of Fine Arts.

[2] Rafferty's husband is Aleksanteri Olli-Pekka Seppälä, an American of Finnish descent, and the Vice President of Strategy and Business Development at the Angeleno Group, a venture capital firm.

They married on June 23, 2001, at the Roman Catholic church of St. Mary in Greenwich, Connecticut,[3] and have two daughters.