Jaimie Lauren Alexander (born Jaimie Lauren Tarbush; March 12, 1984) is an American actress. She is known for portraying Jessi on the TV series Kyle XY and Lady Sif in the Marvel Cinematic Universe films Thor (2011), Thor: The Dark World (2013), and Thor: Love and Thunder (2022), as well as the television series Agents of S.H.I.E.L.D....